207 lines
9.2 KiB
Text
207 lines
9.2 KiB
Text
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# RUN: llc %s -o - -mtriple=x86_64-unknown-unknown \
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# RUN: -experimental-debug-variable-locations -run-pass=livedebugvalues \
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# RUN: | FileCheck %s --check-prefix=CHECK
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#
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# Copy of dbg-phis-merging-in-ldv.mir, where I've added a loop in between the
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# DBG_PHI "definitions" of values, and the DBG_INSTR_REFs where they're used.
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# We should be able to traverse this obstacle.
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--- |
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; ModuleID = 'before.mir'
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source_filename = "test.c"
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target datalayout = "e-m:e-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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define dso_local i32 @foo(i64 %bar, i64 %baz) !dbg !7 {
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entry:
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call void @llvm.dbg.value(metadata i64 %bar, metadata !12, metadata !DIExpression()), !dbg !13
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call void @llvm.dbg.value(metadata i64 %baz, metadata !14, metadata !DIExpression()), !dbg !13
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call void @ext(i64 %bar), !dbg !15
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%add = add nsw i64 %bar, 12, !dbg !16
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call void @llvm.dbg.value(metadata i64 %add, metadata !12, metadata !DIExpression()), !dbg !13
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call void @ext(i64 %add), !dbg !17
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%add1 = add nsw i64 %baz, 1, !dbg !18
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call void @llvm.dbg.value(metadata i64 %add1, metadata !14, metadata !DIExpression()), !dbg !13
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%call = call i64 @getlong(), !dbg !19
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%tobool = icmp ne i64 %call, 0, !dbg !19
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br i1 %tobool, label %if.then, label %if.else, !dbg !21
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if.then: ; preds = %entry
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%add2 = add nsw i64 %add, 1, !dbg !22
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call void @llvm.dbg.value(metadata i64 %add2, metadata !12, metadata !DIExpression()), !dbg !13
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br label %if.end, !dbg !24
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if.else: ; preds = %entry
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%add3 = add nsw i64 %add, 2, !dbg !25
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call void @llvm.dbg.value(metadata i64 %add3, metadata !12, metadata !DIExpression()), !dbg !13
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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%bar.addr.0 = phi i64 [ %add2, %if.then ], [ %add3, %if.else ], !dbg !27
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call void @llvm.dbg.value(metadata i64 %bar.addr.0, metadata !12, metadata !DIExpression()), !dbg !13
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%add4 = add nsw i64 %bar.addr.0, %add1, !dbg !28
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call void @llvm.dbg.value(metadata i64 %add4, metadata !12, metadata !DIExpression()), !dbg !13
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call void @ext(i64 %add4), !dbg !29
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%conv = trunc i64 %add4 to i32, !dbg !30
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ret i32 %conv, !dbg !31
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}
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #0
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declare dso_local void @ext(i64)
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declare dso_local i64 @getlong()
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata) #0
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attributes #0 = { nounwind readnone speculatable willreturn }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: false, nameTableKind: None)
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!1 = !DIFile(filename: "test.c", directory: ".")
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!2 = !{}
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!3 = !{i32 7, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang"}
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!7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 3, type: !8, scopeLine: 3, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10, !11, !11}
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!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!11 = !DIBasicType(name: "long int", size: 64, encoding: DW_ATE_signed)
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!12 = !DILocalVariable(name: "bar", arg: 1, scope: !7, file: !1, line: 3, type: !11)
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!13 = !DILocation(line: 0, scope: !7)
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!14 = !DILocalVariable(name: "baz", arg: 2, scope: !7, file: !1, line: 3, type: !11)
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!15 = !DILocation(line: 4, column: 3, scope: !7)
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!16 = !DILocation(line: 5, column: 7, scope: !7)
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!17 = !DILocation(line: 6, column: 3, scope: !7)
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!18 = !DILocation(line: 7, column: 7, scope: !7)
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!19 = !DILocation(line: 9, column: 7, scope: !20)
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!20 = distinct !DILexicalBlock(scope: !7, file: !1, line: 9, column: 7)
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!21 = !DILocation(line: 9, column: 7, scope: !7)
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!22 = !DILocation(line: 10, column: 9, scope: !23)
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!23 = distinct !DILexicalBlock(scope: !20, file: !1, line: 9, column: 18)
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!24 = !DILocation(line: 11, column: 3, scope: !23)
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!25 = !DILocation(line: 12, column: 9, scope: !26)
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!26 = distinct !DILexicalBlock(scope: !20, file: !1, line: 11, column: 10)
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!27 = !DILocation(line: 0, scope: !20)
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!28 = !DILocation(line: 15, column: 7, scope: !7)
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!29 = !DILocation(line: 16, column: 3, scope: !7)
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!30 = !DILocation(line: 17, column: 10, scope: !7)
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!31 = !DILocation(line: 17, column: 3, scope: !7)
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...
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---
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name: foo
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alignment: 16
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tracksRegLiveness: true
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debugInstrRef: true
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liveins:
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- { reg: '$rdi' }
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- { reg: '$rsi' }
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frameInfo:
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stackSize: 24
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offsetAdjustment: -24
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maxAlignment: 1
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adjustsStack: true
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hasCalls: true
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 16
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fixedStack:
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- { id: 0, type: spill-slot, offset: -24, size: 8, alignment: 8, callee-saved-register: '$rbx' }
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- { id: 1, type: spill-slot, offset: -16, size: 8, alignment: 16, callee-saved-register: '$r14' }
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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successors: %bb.2, %bb.1
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liveins: $rdi, $rsi, $r14, $rbx
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frame-setup PUSH64r killed $r14, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 16
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frame-setup PUSH64r killed $rbx, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 24
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frame-setup PUSH64r undef $rax, implicit-def $rsp, implicit $rsp
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CFI_INSTRUCTION def_cfa_offset 32
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CFI_INSTRUCTION offset $rbx, -24
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CFI_INSTRUCTION offset $r14, -16
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$r14 = MOV64rr $rsi
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$rbx = MOV64rr $rdi
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !15
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renamable $rbx = ADD64ri32 killed renamable $rbx, 12, implicit-def $eflags, debug-location !16
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$rdi = MOV64rr $rbx, debug-location !17
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !17
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renamable $r14 = ADD64ri32 killed renamable $r14, 1, implicit-def $eflags, debug-location !18
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CALL64pcrel32 @getlong, csr_64, implicit $rsp, implicit $ssp, implicit-def $rax, debug-location !19
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CMP64ri8 killed renamable $rax, 0, implicit-def $eflags, debug-location !19
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JCC_1 %bb.1, 5, implicit $eflags, debug-location !21
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bb.2.if.else:
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liveins: $rbx, $r14, $rax
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renamable $rbx = ADD64ri32 killed renamable $rbx, 2, implicit-def $eflags, debug-location !25
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DBG_PHI $r14, 1
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DBG_PHI $rbx, 2
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DBG_PHI $rax, 3
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$rax = MOV64ri 0
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JMP_1 %bb.3
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bb.1.if.then:
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liveins: $rbx, $r14, $rax
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renamable $rbx = ADD64ri32 killed renamable $rbx, 1, implicit-def $eflags, debug-location !22
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DBG_PHI $r14, 1
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DBG_PHI $rbx, 2
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DBG_PHI $rax, 3
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bb.3:
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$r15 = MOV64ri 0
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CMP64ri8 $r15, 0, implicit-def $eflags, debug-location !19
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JCC_1 %bb.3, 5, implicit $eflags, debug-location !21
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bb.4:
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liveins: $rbx, $r14
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DBG_INSTR_REF !14, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(1, 0), debug-location !13
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DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13
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DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(3, 0), debug-location !13
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; Value number 1 is live-through the above control flow from the two
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; DBG_PHIs:
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(1, 0)
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; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $r14
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;
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; While value number 2 has different defs that merge on entry to bb.3.
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; These are both in $rbx though, and we should find its location:
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)
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; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $rbx
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;
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; Value number 3 cannot be resolved because $rax is clobbered in bb.2,
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; meaning the merged value in bb.3 is incorrect. It should produce a
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; DBG_VALUE $noreg.
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(3, 0)
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; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg
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renamable $rbx = ADD64rr killed renamable $rbx, killed renamable $r14, implicit-def $eflags, debug-location !28
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DBG_INSTR_REF !12, !DIExpression(DW_OP_LLVM_arg, 0), dbg-instr-ref(2, 0), debug-location !13
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; After clobbering rbx, the variable location should not be available.
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; CHECK: DBG_INSTR_REF {{.+}}, dbg-instr-ref(2, 0)
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; CHECK-NEXT: DBG_VALUE_LIST {{.+}} $noreg
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$rdi = MOV64rr $rbx, debug-location !29
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CALL64pcrel32 @ext, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, debug-location !29
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$eax = MOV32rr $ebx, implicit killed $rbx, debug-location !31
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$rsp = frame-destroy ADD64ri8 $rsp, 8, implicit-def dead $eflags, debug-location !31
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CFI_INSTRUCTION def_cfa_offset 24, debug-location !31
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$rbx = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31
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CFI_INSTRUCTION def_cfa_offset 16, debug-location !31
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$r14 = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !31
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CFI_INSTRUCTION def_cfa_offset 8, debug-location !31
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RET64 implicit $eax, debug-location !31
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...
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