1# RUN: llc -run-pass=livedebugvalues -o - %s | FileCheck %s 2 3# Based on the following C reproducer: 4# 5# extern void ext(int *); 6# extern int interesting(int *); 7# extern int *value(void); 8# 9# static void callee(int *p1, int *p2) { 10# if (interesting(p2)) 11# for (;;) 12# ext(p1); 13# ext(p2); 14# } 15# 16# void caller() { 17# int *local = value(); 18# callee(local, (int *)0xabcd); 19# } 20# 21# Generated using: 22# 23# clang -Os -fno-inline -Xclang -femit-debug-entry-values -g --target=armeb. 24 25--- | 26 target datalayout = "E-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64" 27 target triple = "armebv4t-unknown-unknown" 28 29 ; Function Attrs: noinline nounwind optsize 30 define arm_aapcs_vfpcc void @caller() #0 !dbg !20 { 31 entry: 32 unreachable 33 } 34 35 ; Function Attrs: noinline nounwind optsize 36 define internal arm_aapcs_vfpcc void @callee(i32* %p1) unnamed_addr #0 !dbg !29 { 37 entry: 38 unreachable 39 } 40 41 declare !dbg !4 arm_aapcs_vfpcc i32* @value() 42 declare !dbg !9 arm_aapcs_vfpcc i32 @interesting(i32*) 43 declare !dbg !12 arm_aapcs_vfpcc void @ext(i32*) 44 45 ; Function Attrs: nounwind readnone speculatable willreturn 46 declare void @llvm.dbg.value(metadata, metadata, metadata) #1 47 48 attributes #0 = { noinline nounwind optsize "frame-pointer"="all" } 49 attributes #1 = { nounwind readnone speculatable willreturn } 50 51 !llvm.dbg.cu = !{!0} 52 !llvm.module.flags = !{!15, !16, !17, !18} 53 !llvm.ident = !{!19} 54 55 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 10.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3, nameTableKind: None) 56 !1 = !DIFile(filename: "armeb.c", directory: "/") 57 !2 = !{} 58 !3 = !{!4, !7, !9, !12} 59 !4 = !DISubprogram(name: "value", scope: !1, file: !1, line: 3, type: !5, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 60 !5 = !DISubroutineType(types: !6) 61 !6 = !{!7} 62 !7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 32) 63 !8 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 64 !9 = !DISubprogram(name: "interesting", scope: !1, file: !1, line: 2, type: !10, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 65 !10 = !DISubroutineType(types: !11) 66 !11 = !{!8, !7} 67 !12 = !DISubprogram(name: "ext", scope: !1, file: !1, line: 1, type: !13, flags: DIFlagPrototyped, spFlags: DISPFlagOptimized, retainedNodes: !2) 68 !13 = !DISubroutineType(types: !14) 69 !14 = !{null, !7} 70 !15 = !{i32 2, !"Dwarf Version", i32 4} 71 !16 = !{i32 2, !"Debug Info Version", i32 3} 72 !17 = !{i32 1, !"wchar_size", i32 4} 73 !18 = !{i32 1, !"min_enum_size", i32 4} 74 !19 = !{!"clang version 10.0.0"} 75 !20 = distinct !DISubprogram(name: "caller", scope: !1, file: !1, line: 12, type: !21, scopeLine: 12, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !23) 76 !21 = !DISubroutineType(types: !22) 77 !22 = !{null} 78 !23 = !{!24} 79 !24 = !DILocalVariable(name: "local", scope: !20, file: !1, line: 13, type: !7) 80 !25 = !DILocation(line: 13, scope: !20) 81 !26 = !DILocation(line: 0, scope: !20) 82 !27 = !DILocation(line: 14, scope: !20) 83 !28 = !DILocation(line: 15, scope: !20) 84 !29 = distinct !DISubprogram(name: "callee", scope: !1, file: !1, line: 5, type: !30, scopeLine: 5, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !32) 85 !30 = !DISubroutineType(types: !31) 86 !31 = !{null, !7, !7} 87 !32 = !{!33, !34} 88 !33 = !DILocalVariable(name: "p1", arg: 1, scope: !29, file: !1, line: 5, type: !7) 89 !34 = !DILocalVariable(name: "p2", arg: 2, scope: !29, file: !1, line: 5, type: !7) 90 !35 = !DILocation(line: 0, scope: !29) 91 !36 = !DILocation(line: 6, scope: !37) 92 !37 = distinct !DILexicalBlock(scope: !29, file: !1, line: 6) 93 !38 = !DILocation(line: 6, scope: !29) 94 !39 = !DILocation(line: 7, scope: !40) 95 !40 = distinct !DILexicalBlock(scope: !37, file: !1, line: 7) 96 !41 = !DILocation(line: 8, scope: !42) 97 !42 = distinct !DILexicalBlock(scope: !40, file: !1, line: 7) 98 !43 = !DILocation(line: 7, scope: !42) 99 !44 = distinct !{!44, !39, !45} 100 !45 = !DILocation(line: 8, scope: !40) 101 !46 = !DILocation(line: 9, scope: !29) 102 !47 = !DILocation(line: 10, scope: !29) 103 104... 105--- 106name: caller 107alignment: 4 108tracksRegLiveness: true 109body: | 110 bb.0: 111 liveins: $lr 112 113 $sp = frame-setup STMDB_UPD $sp, 14, $noreg, $r11, killed $lr 114 frame-setup CFI_INSTRUCTION def_cfa_offset 8 115 frame-setup CFI_INSTRUCTION offset $lr, -4 116 frame-setup CFI_INSTRUCTION offset $r11, -8 117 $r11 = frame-setup MOVr $sp, 14, $noreg, $noreg 118 frame-setup CFI_INSTRUCTION def_cfa_register $r11 119 BL @value, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit-def $sp, implicit-def $r0, debug-location !25 120 DBG_VALUE $r0, $noreg, !24, !DIExpression(), debug-location !26 121 $sp = LDMIA_UPD $sp, 14, $noreg, def $r11, def $lr, debug-location !27 122 TAILJMPd @callee, implicit $sp, implicit $sp, implicit killed $r0, debug-location !27 123 124... 125--- 126name: callee 127tracksRegLiveness: true 128stack: 129 - { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4, 130 stack-id: default, callee-saved-register: '$lr', callee-saved-restored: true, 131 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 132 - { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4, 133 stack-id: default, callee-saved-register: '$r11', callee-saved-restored: true, 134 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 135 - { id: 2, name: '', type: spill-slot, offset: -12, size: 4, alignment: 4, 136 stack-id: default, callee-saved-register: '$r10', callee-saved-restored: true, 137 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 138 - { id: 3, name: '', type: spill-slot, offset: -16, size: 4, alignment: 4, 139 stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true, 140 debug-info-variable: '', debug-info-expression: '', debug-info-location: '' } 141body: | 142 bb.0: 143 successors: %bb.2(0x30000000), %bb.1(0x50000000) 144 liveins: $r0, $r4, $r10, $lr 145 146 DBG_VALUE $r0, $noreg, !33, !DIExpression(), debug-location !35 147 $sp = frame-setup STMDB_UPD $sp, 14, $noreg, killed $r4, killed $r10, $r11, killed $lr 148 frame-setup CFI_INSTRUCTION def_cfa_offset 16 149 frame-setup CFI_INSTRUCTION offset $lr, -4 150 frame-setup CFI_INSTRUCTION offset $r11, -8 151 frame-setup CFI_INSTRUCTION offset $r10, -12 152 frame-setup CFI_INSTRUCTION offset $r4, -16 153 $r11 = frame-setup ADDri $sp, 8, 14, $noreg, $noreg 154 frame-setup CFI_INSTRUCTION def_cfa $r11, 8 155 $r4 = MOVr killed $r0, 14, $noreg, $noreg 156 DBG_VALUE $r4, $noreg, !33, !DIExpression(), debug-location !35 157 $r0 = MOVi 205, 14, $noreg, $noreg 158 $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg 159 ; The MOVI and ORRri produce the second parameter's (!34) value which has 160 ; been propagated from caller(). 161 DBG_VALUE $r0, $noreg, !34, !DIExpression(), debug-location !35 162 BL @interesting, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, implicit-def $r0, debug-location !36 163 CMPri killed renamable $r0, 0, 14, $noreg, implicit-def $cpsr, debug-location !38 164 Bcc %bb.2, 0, killed $cpsr, debug-location !38 165 166 bb.1: 167 liveins: $r4 168 169 $r0 = MOVr $r4, 14, $noreg, $noreg, debug-location !41 170 BL @ext, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit killed $r0, implicit-def $sp, debug-location !41 171 B %bb.1, debug-location !43 172 173 bb.2: 174 $r0 = MOVi 205, 14, $noreg, $noreg 175 $r0 = ORRri killed $r0, 43776, 14, $noreg, $noreg 176 $sp = LDMIA_UPD $sp, 14, $noreg, def $r4, def $r10, def $r11, def $lr, debug-location !46 177 TAILJMPd @ext, implicit $sp, implicit $sp, implicit killed $r0, debug-location !46 178 179... 180 181# In this test case the second parameter's value has been propagated from the 182# caller to the callee, so we should not emit any entry value DBG_VALUEs for 183# that parameter. The second parameter reuses the first parameter's register 184# ($r0), and previously we would incorrectly emit an entry value for the 185# parameter using that register. 186 187# CHECK-DAG: ![[P1:[0-9]+]] = !DILocalVariable(name: "p1", arg: 1 188# CHECK-DAG: ![[P2:[0-9]+]] = !DILocalVariable(name: "p2", arg: 2 189 190# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value 191 192# CHECK: DBG_VALUE $r0, $noreg, ![[P1]], !DIExpression(DW_OP_LLVM_entry_value 193 194# CHECK-NOT: DBG_VALUE $r0, $noreg, ![[P2]], !DIExpression(DW_OP_LLVM_entry_value 195