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, 92 insertions, 0 deletions

diff --git a/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll b/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll
new file mode 100644
index 00000000000..ff9c7851826
--- /dev/null
+++ b/llvm/test/DebugInfo/Generic/accel-table-hash-collisions.ll
@@ -0,0 +1,92 @@
+; REQUIRES: object-emission
+; RUN: %llc_dwarf -dwarf-accel-tables=Enable -filetype=obj -o - < %s | llvm-dwarfdump -debug-dump=apple_names - | FileCheck %s
+
+; Generated from the following C code using
+; clang -S -emit-llvm hash-collision.c
+;
+; The names of the variables have been chosen so that they produce hash collisions.
+; There are 12 names here that are hashed to only 6 hashes (each pair of lines
+; hashes to the same value, see the CHECK lines below).
+;
+; int ForceTopDown;
+; int _ZNSt3__116allocator_traitsINS_9allocatorINS_11__tree_nodeINS_12__value_typeIPN4llvm10BasicBlockEPNS4_10RegionNodeEEEPvEEEEE11__constructIS9_JNS_4pairIS6_S8_EEEEEvNS_17integral_constantIbLb1EEERSC_PT_DpOT0_;
+; int _ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE; 
+; int _ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv;
+; int _ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE;
+; int _ZN4llvm15ScalarEvolution14getSignedRangeEPKNS_4SCEVE;
+; int k1;
+; int is;
+; int setStmt;
+; int _ZN4llvm5TwineC1Ei;
+; int _ZNK5clang12OverrideAttr5cloneERNS_10ASTContextE;
+; int _ZN4llvm22MachineModuleInfoMachOD2Ev;
+
+; Check that we have the right amount of hashes.
+; CHECK: Bucket count = 6
+; CHECK: Hashes count = 6
+
+; Check that all the names are present in the output
+; CHECK:  Hash = 0x00597841
+; CHECK:    Name: {{[0-9a-f]*}} "is"
+; CHECK:    Name: {{[0-9a-f]*}} "k1"
+
+; CHECK: Hash = 0xa4b42a1e
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv"
+
+; CHECK: Hash = 0xeee7c0b2
+; CHECK:    Name: {{[0-9a-f]*}} "_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm15ScalarEvolution14getSignedRangeEPKNS_4SCEVE"
+
+; CHECK: Hash = 0xea48ac5f
+; CHECK:    Name: {{[0-9a-f]*}} "ForceTopDown"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZNSt3__116allocator_traitsINS_9allocatorINS_11__tree_nodeINS_12__value_typeIPN4llvm10BasicBlockEPNS4_10RegionNodeEEEPvEEEEE11__constructIS9_JNS_4pairIS6_S8_EEEEEvNS_17integral_constantIbLb1EEERSC_PT_DpOT0_"
+
+; CHECK:  Hash = 0x6b22f71f
+; CHECK:    Name: {{[0-9a-f]*}} "_ZNK5clang12OverrideAttr5cloneERNS_10ASTContextE"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm22MachineModuleInfoMachOD2Ev"
+
+; CHECK:  Hash = 0x8c248979
+; CHECK:    Name: {{[0-9a-f]*}} "setStmt"
+; CHECK:    Name: {{[0-9a-f]*}} "_ZN4llvm5TwineC1Ei"
+
+
+
+@ForceTopDown = common global i32 0, align 4
+@_ZNSt3__116allocator_traitsINS_9allocatorINS_11__tree_nodeINS_12__value_typeIPN4llvm10BasicBlockEPNS4_10RegionNodeEEEPvEEEEE11__constructIS9_JNS_4pairIS6_S8_EEEEEvNS_17integral_constantIbLb1EEERSC_PT_DpOT0_ = common global i32 0, align 4
+@_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE = common global i32 0, align 4
+@_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv = common global i32 0, align 4
+@_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE = common global i32 0, align 4
+@_ZN4llvm15ScalarEvolution14getSignedRangeEPKNS_4SCEVE = common global i32 0, align 4
+@k1 = common global i32 0, align 4
+@is = common global i32 0, align 4
+@setStmt = common global i32 0, align 4
+@_ZN4llvm5TwineC1Ei = common global i32 0, align 4
+@_ZNK5clang12OverrideAttr5cloneERNS_10ASTContextE = common global i32 0, align 4
+@_ZN4llvm22MachineModuleInfoMachOD2Ev = common global i32 0, align 4
+
+!llvm.dbg.cu = !{!0}
+!llvm.module.flags = !{!17, !18, !19}
+!llvm.ident = !{!20}
+
+!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.7.0 (trunk 231548) (llvm/trunk 231547)", isOptimized: false, runtimeVersion: 0, emissionKind: 1, enums: !2, retainedTypes: !2, subprograms: !2, globals: !3, imports: !2)
+!1 = !DIFile(filename: "hash-collisions.c", directory: "/tmp")
+!2 = !{}
+!3 = !{!4, !6, !7, !8, !9, !10, !11, !12, !13, !14, !15, !16}
+!4 = !DIGlobalVariable(name: "ForceTopDown", scope: !0, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, variable: i32* @ForceTopDown)
+!5 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
+!6 = !DIGlobalVariable(name: "_ZNSt3__116allocator_traitsINS_9allocatorINS_11__tree_nodeINS_12__value_typeIPN4llvm10BasicBlockEPNS4_10RegionNodeEEEPvEEEEE11__constructIS9_JNS_4pairIS6_S8_EEEEEvNS_17integral_constantIbLb1EEERSC_PT_DpOT0_", scope: !0, file: !1, line: 2, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZNSt3__116allocator_traitsINS_9allocatorINS_11__tree_nodeINS_12__value_typeIPN4llvm10BasicBlockEPNS4_10RegionNodeEEEPvEEEEE11__constructIS9_JNS_4pairIS6_S8_EEEEEvNS_17integral_constantIbLb1EEERSC_PT_DpOT0_)
+!7 = !DIGlobalVariable(name: "_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE", scope: !0, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZN5clang23DataRecursiveASTVisitorIN12_GLOBAL__N_124UnusedBackingIvarCheckerEE26TraverseCUDAKernelCallExprEPNS_18CUDAKernelCallExprE)
+!8 = !DIGlobalVariable(name: "_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv", scope: !0, file: !1, line: 4, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZN4llvm16DenseMapIteratorIPNS_10MDLocationENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS1_EENS3_12DenseSetPairIS2_EELb0EE23AdvancePastEmptyBucketsEv)
+!9 = !DIGlobalVariable(name: "_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE", scope: !0, file: !1, line: 5, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZNK4llvm12LivePhysRegs5printERNS_11raw_ostreamE)
+!10 = !DIGlobalVariable(name: "_ZN4llvm15ScalarEvolution14getSignedRangeEPKNS_4SCEVE", scope: !0, file: !1, line: 6, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZN4llvm15ScalarEvolution14getSignedRangeEPKNS_4SCEVE)
+!11 = !DIGlobalVariable(name: "k1", scope: !0, file: !1, line: 7, type: !5, isLocal: false, isDefinition: true, variable: i32* @k1)
+!12 = !DIGlobalVariable(name: "is", scope: !0, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, variable: i32* @is)
+!13 = !DIGlobalVariable(name: "setStmt", scope: !0, file: !1, line: 9, type: !5, isLocal: false, isDefinition: true, variable: i32* @setStmt)
+!14 = !DIGlobalVariable(name: "_ZN4llvm5TwineC1Ei", scope: !0, file: !1, line: 10, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZN4llvm5TwineC1Ei)
+!15 = !DIGlobalVariable(name: "_ZNK5clang12OverrideAttr5cloneERNS_10ASTContextE", scope: !0, file: !1, line: 11, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZNK5clang12OverrideAttr5cloneERNS_10ASTContextE)
+!16 = !DIGlobalVariable(name: "_ZN4llvm22MachineModuleInfoMachOD2Ev", scope: !0, file: !1, line: 12, type: !5, isLocal: false, isDefinition: true, variable: i32* @_ZN4llvm22MachineModuleInfoMachOD2Ev)
+!17 = !{i32 2, !"Dwarf Version", i32 2}
+!18 = !{i32 2, !"Debug Info Version", i32 3}
+!19 = !{i32 1, !"PIC Level", i32 2}
+!20 = !{!"clang version 3.7.0 (trunk 231548) (llvm/trunk 231547)"}