207 lines · plain
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=CHECK4#5# Copy of dbg-phis-merging-in-ldv.mir, where I've added a loop in between the6# 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 !1317 call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !1318 call void @ext(i64 %bar), !dbg !1519 %add = add nsw i64 %bar, 12, !dbg !1620 call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !1321 call void @ext(i64 %add), !dbg !1722 %add1 = add nsw i64 %baz, 1, !dbg !1823 call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !1324 %call = call i64 @getlong(), !dbg !1925 %tobool = icmp ne i64 %call, 0, !dbg !1926 br i1 %tobool, label %if.then, label %if.else, !dbg !2127 28 if.then: ; preds = %entry29 %add2 = add nsw i64 %add, 1, !dbg !2230 call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !1331 br label %if.end, !dbg !2432 33 if.else: ; preds = %entry34 %add3 = add nsw i64 %add, 2, !dbg !2535 call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !1336 br label %if.end37 38 if.end: ; preds = %if.else, %if.then39 %bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !2740 call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !1341 %add4 = add nsw i64 %bar.addr.0, %add1, !dbg !2842 call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !1343 call void @ext(i64 %add4), !dbg !2944 %conv = trunc i64 %add4 to i32, !dbg !3045 ret i32 %conv, !dbg !3146 }47 48 ; Function Attrs: nounwind readnone speculatable willreturn49 declare void @llvm.dbg.declare(metadata, metadata, metadata) #050 51 declare dso_local void @ext(i64)52 53 declare dso_local i64 @getlong()54 55 ; Function Attrs: nounwind readnone speculatable willreturn56 declare void @llvm.dbg.value(metadata, metadata, metadata) #057 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: foo100alignment: 16101tracksRegLiveness: true102debugInstrRef: true103liveins:104 - { reg: '$rdi' }105 - { reg: '$rsi' }106frameInfo:107 stackSize: 24108 offsetAdjustment: -24109 maxAlignment: 1110 adjustsStack: true111 hasCalls: true112 maxCallFrameSize: 0113 cvBytesOfCalleeSavedRegisters: 16114fixedStack: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.1121 liveins: $rdi, $rsi, $r14, $rbx122 123 frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp124 CFI_INSTRUCTION def_cfa_offset 16125 frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp126 CFI_INSTRUCTION def_cfa_offset 24127 frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp128 CFI_INSTRUCTION def_cfa_offset 32129 CFI_INSTRUCTION offset $rbx, -24130 CFI_INSTRUCTION offset $r14, -16131 $r14 = MOV64rr $rsi132 $rbx = MOV64rr $rdi133 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15134 renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16135 $rdi = MOV64rr $rbx, debug-location !17136 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17137 renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18138 CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19139 CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19140 JCC_1 %bb.1, 5, implicit $eflags, debug-location !21141 142 bb.2.if.else:143 liveins: $rbx, $r14, $rax144 145 renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25146 DBG_PHI $r14, 1147 DBG_PHI $rbx, 2148 DBG_PHI $rax, 3149 $rax = MOV64ri 0150 JMP_1 %bb.3151 152 bb.1.if.then:153 liveins: $rbx, $r14, $rax154 155 renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22156 DBG_PHI $r14, 1157 DBG_PHI $rbx, 2158 DBG_PHI $rax, 3159 160 bb.3:161 $r15 = MOV64ri 0162 CMP64ri8 $r15, 0, implicit-def $eflags, debug-location !19163 JCC_1 %bb.3, 5, implicit $eflags, debug-location !21164 165 bb.4:166 liveins: $rbx, $r14167 168 DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13169 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13170 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13171 172 ; Value number 1 is live-through the above control flow from the two173 ; DBG_PHIs:174 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)175 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $r14176 ;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 {{.+}} $rbx181 ;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 a184 ; DBG_VALUE $noreg.185 ; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0)186 ; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg187 188 renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28189 DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13190 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 {{.+}} $noreg194 195 $rdi = MOV64rr $rbx, debug-location !29196 CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29197 $eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31198 $rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31199 CFI_INSTRUCTION def_cfa_offset 24, debug-location !31200 $rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31201 CFI_INSTRUCTION def_cfa_offset 16, debug-location !31202 $r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31203 CFI_INSTRUCTION def_cfa_offset 8, debug-location !31204 RET64 implicit $eax, debug-location !31205 206...207