1# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \ 2# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues \ 3# RUN: | FileCheck %s --check-prefix=CHECK 4# 5# Copy of dbg-phis-merging-in-ldv.mir, where I've added a loop in between the 6# DBG_PHI "definitions" of values, and the DBG_INSTR_REFs where they're used. 7# We should be able to traverse this obstacle. 8--- | 9 ; ModuleID = 'before.mir' 10 source_filename = "test.c" 11 target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128" 12 target triple = "x86_64-unknown-linux-gnu" 13 14 define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 { 15 entry: 16 call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13 17 call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13 18 call void @ext(i64 %bar), !dbg !15 19 %add = add nsw i64 %bar, 12, !dbg !16 20 call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13 21 call void @ext(i64 %add), !dbg !17 22 %add1 = add nsw i64 %baz, 1, !dbg !18 23 call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !13 24 %call = call i64 @getlong(), !dbg !19 25 %tobool = icmp ne i64 %call, 0, !dbg !19 26 br i1 %tobool, label %if.then, label %if.else, !dbg !21 27 28 if.then: ; preds = %entry 29 %add2 = add nsw i64 %add, 1, !dbg !22 30 call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13 31 br label %if.end, !dbg !24 32 33 if.else: ; preds = %entry 34 %add3 = add nsw i64 %add, 2, !dbg !25 35 call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !13 36 br label %if.end 37 38 if.end: ; preds = %if.else, %if.then 39 %bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !27 40 call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13 41 %add4 = add nsw i64 %bar.addr.0, %add1, !dbg !28 42 call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !13 43 call void @ext(i64 %add4), !dbg !29 44 %conv = trunc i64 %add4 to i32, !dbg !30 45 ret i32 %conv, !dbg !31 46 } 47 48 ; Function Attrs: nounwind readnone speculatable willreturn 49 declare void @llvm.dbg.declare(metadata, metadata, metadata) #0 50 51 declare dso_local void @ext(i64) 52 53 declare dso_local i64 @getlong() 54 55 ; Function Attrs: nounwind readnone speculatable willreturn 56 declare void @llvm.dbg.value(metadata, metadata, metadata) #0 57 58 attributes #0 = { nounwind readnone speculatable willreturn } 59 60 !llvm.dbg.cu = !{!0} 61 !llvm.module.flags = !{!3, !4, !5} 62 !llvm.ident = !{!6} 63 64 !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None) 65 !1 = !DIFile(filename: "test.c", directory: ".") 66 !2 = !{} 67 !3 = !{i32 7, !"Dwarf Version", i32 4} 68 !4 = !{i32 2, !"Debug Info Version", i32 3} 69 !5 = !{i32 1, !"wchar_size", i32 4} 70 !6 = !{!"clang"} 71 !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2) 72 !8 = !DISubroutineType(types: !9) 73 !9 = !{!10, !11, !11} 74 !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed) 75 !11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed) 76 !12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11) 77 !13 = !DILocation(line: 0, scope: !7) 78 !14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11) 79 !15 = !DILocation(line: 4, column: 3, scope: !7) 80 !16 = !DILocation(line: 5, column: 7, scope: !7) 81 !17 = !DILocation(line: 6, column: 3, scope: !7) 82 !18 = !DILocation(line: 7, column: 7, scope: !7) 83 !19 = !DILocation(line: 9, column: 7, scope: !20) 84 !20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7) 85 !21 = !DILocation(line: 9, column: 7, scope: !7) 86 !22 = !DILocation(line: 10, column: 9, scope: !23) 87 !23 = distinct !DILexicalBlock(scope: !20, file: !1, line: 9, column: 18) 88 !24 = !DILocation(line: 11, column: 3, scope: !23) 89 !25 = !DILocation(line: 12, column: 9, scope: !26) 90 !26 = distinct !DILexicalBlock(scope: !20, file: !1, line: 11, column: 10) 91 !27 = !DILocation(line: 0, scope: !20) 92 !28 = !DILocation(line: 15, column: 7, scope: !7) 93 !29 = !DILocation(line: 16, column: 3, scope: !7) 94 !30 = !DILocation(line: 17, column: 10, scope: !7) 95 !31 = !DILocation(line: 17, column: 3, scope: !7) 96 97... 98--- 99name: foo 100alignment: 16 101tracksRegLiveness: true 102debugInstrRef: true 103liveins: 104 - { reg: '$rdi' } 105 - { reg: '$rsi' } 106frameInfo: 107 stackSize: 24 108 offsetAdjustment: -24 109 maxAlignment: 1 110 adjustsStack: true 111 hasCalls: true 112 maxCallFrameSize: 0 113 cvBytesOfCalleeSavedRegisters: 16 114fixedStack: 115 - { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' } 116 - { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' } 117machineFunctionInfo: {} 118body: | 119 bb.0.entry: 120 successors: %bb.2, %bb.1 121 liveins: $rdi, $rsi, $r14, $rbx 122 123 frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp 124 CFI_INSTRUCTION def_cfa_offset 16 125 frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp 126 CFI_INSTRUCTION def_cfa_offset 24 127 frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp 128 CFI_INSTRUCTION def_cfa_offset 32 129 CFI_INSTRUCTION offset $rbx, -24 130 CFI_INSTRUCTION offset $r14, -16 131 $r14 = MOV64rr $rsi 132 $rbx = MOV64rr $rdi 133 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15 134 renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16 135 $rdi = MOV64rr $rbx, debug-location !17 136 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17 137 renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18 138 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19 139 CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19 140 JCC_1 %bb.1, 5, implicit $eflags, debug-location !21 141 142 bb.2.if.else: 143 liveins: $rbx, $r14, $rax 144 145 renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25 146 DBG_PHI $r14, 1 147 DBG_PHI $rbx, 2 148 DBG_PHI $rax, 3 149 $rax = MOV64ri 0 150 JMP_1 %bb.3 151 152 bb.1.if.then: 153 liveins: $rbx, $r14, $rax 154 155 renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22 156 DBG_PHI $r14, 1 157 DBG_PHI $rbx, 2 158 DBG_PHI $rax, 3 159 160 bb.3: 161 $r15 = MOV64ri 0 162 CMP64ri8 $r15, 0, implicit-def $eflags, debug-location !19 163 JCC_1 %bb.3, 5, implicit $eflags, debug-location !21 164 165 bb.4: 166 liveins: $rbx, $r14 167 168 DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13 169 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13 170 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13 171 172 ; Value number 1 is live-through the above control flow from the two 173 ; DBG_PHIs: 174 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0) 175 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $r14 176 ; 177 ; While value number 2 has different defs that merge on entry to bb.3. 178 ; These are both in $rbx though, and we should find its location: 179 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0) 180 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $rbx 181 ; 182 ; Value number 3 cannot be resolved because $rax is clobbered in bb.2, 183 ; meaning the merged value in bb.3 is incorrect. It should produce a 184 ; DBG_VALUE $noreg. 185 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0) 186 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg 187 188 renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28 189 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13 190 191 ; After clobbering rbx, the variable location should not be available. 192 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0) 193 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg 194 195 $rdi = MOV64rr $rbx, debug-location !29 196 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29 197 $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31 198 $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31 199 CFI_INSTRUCTION def_cfa_offset 24, debug-location !31 200 $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 201 CFI_INSTRUCTION def_cfa_offset 16, debug-location !31 202 $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31 203 CFI_INSTRUCTION def_cfa_offset 8, debug-location !31 204 RET64 implicit $eax, debug-location !31 205 206... 207