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[DebugInfo] Test for variable range un-coalescing
LiveDebugVariables can coalesce ranges of variable locations across multiple basic blocks. However when it recreates DBG_VALUE instructions, it has to recreate one DBG_VALUE per block, otherwise it doesn't represent the pre-regalloc layout and variable assignments can go missing. This feature works -- however while mucking around with LiveDebugVariables, I commented the relevant code it out and no tests failed. Thus, here's a test that checks LiveDebugVariables preserves DBG_VALUEs across block boundaries. Differential Revision: https://reviews.llvm.org/D66347 llvm-svn: 369243
This commit is contained in:
Jeremy Morse
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commit
cecbc1bc9f
138
test/DebugInfo/MIR/X86/livedebugvars-crossbb-interval.mir
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138
test/DebugInfo/MIR/X86/livedebugvars-crossbb-interval.mir
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# RUN: llc -start-after=phi-node-elimination -stop-after=virtregrewriter %s -mtriple=x86_64-unknown-unknown -o - | FileCheck %s
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#
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# Test that when a livedebugvars interval crosses a basic block boundary,
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# DBG_VALUEs are created in each covered basic block. In the IR below, control
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# flow moves from the bottom upwards, and the DBG_VALUEs from the entry block
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# to bb.1 become a single range. Check that they're transformed back into two
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# DBG_VALUEs after regalloc.
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# These checks look at the entry and bb.1 blocks, and ensure that there is a
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# DBG_VALUE in each.
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# CHECK: ![[VARNUM:[0-9]+]] = !DILocalVariable(name: "b",
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# CHECK-LABEL: name: bar
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# CHECK-LABEL: bb.0.entry:
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# CHECK: DBG_VALUE $[[SOMEREG:[a-z]+]], $noreg, ![[VARNUM]], !DIExpression()
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# CHECK-NEXT: JMP_1 %bb.3
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# CHECK-LABEL: bb.1.bb1:
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# CHECK: DBG_VALUE $[[SOMEREG]], $noreg, ![[VARNUM]], !DIExpression()
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# CHECK-NEXT: JMP_1 %bb.4
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--- |
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; ModuleID = 'tmp.ll'
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source_filename = "tmp.ll"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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%struct.a = type { i32 }
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; Function Attrs: nounwind ssp
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define i32 @bar(%struct.a* nocapture %b, i32 %shoes) !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata i32 %shoes, metadata !9, metadata !DIExpression()), !dbg !16
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%tmp1 = getelementptr inbounds %struct.a, %struct.a* %b, i64 0, i32 0, !dbg !17
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br label %bb3
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bb1: ; preds = %bb2
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tail call void @llvm.dbg.value(metadata i32 %shoes, metadata !9, metadata !DIExpression()), !dbg !16
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%add = add nsw i32 %tmp2, 1, !dbg !18
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br label %exit
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bb2: ; preds = %bb3
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tail call void @llvm.dbg.value(metadata i32 %tmp2, metadata !14, metadata !DIExpression()), !dbg !17
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%call = tail call i32 (...) @foo(i32 %tmp2), !dbg !19
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br label %bb1
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bb3: ; preds = %entry
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%tmp2 = load i32, i32* %tmp1, align 4, !dbg !17
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br label %bb2
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exit: ; preds = %bb1
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ret i32 %shoes, !dbg !18
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}
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declare i32 @foo(...)
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; Function Attrs: nounwind readnone speculatable willreturn
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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; Function Attrs: nounwind
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declare void @llvm.stackprotector(i8*, i8**)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 2.9 (trunk 122997)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !2)
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!1 = !DIFile(filename: "bar.c", directory: "/private/tmp")
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!2 = !{}
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!3 = !{i32 1, !"Debug Info Version", i32 3}
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!4 = distinct !DISubprogram(name: "bar", scope: !1, file: !1, line: 5, type: !5, virtualIndex: 6, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9, !14}
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!9 = !DILocalVariable(name: "b", arg: 1, scope: !4, file: !1, line: 5, type: !10)
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, scope: !0, baseType: !11, size: 64, align: 64)
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!11 = !DICompositeType(tag: DW_TAG_structure_type, name: "a", scope: !0, file: !1, line: 1, size: 32, align: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !1, file: !1, line: 2, baseType: !7, size: 32, align: 32)
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!14 = !DILocalVariable(name: "x", scope: !15, file: !1, line: 6, type: !7)
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!15 = distinct !DILexicalBlock(scope: !4, file: !1, line: 5, column: 22)
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!16 = !DILocation(line: 5, column: 19, scope: !4)
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!17 = !DILocation(line: 6, column: 14, scope: !15)
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!18 = !DILocation(line: 8, column: 2, scope: !15)
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!19 = !DILocation(line: 7, column: 2, scope: !15)
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...
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---
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name: bar
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alignment: 4
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tracksRegLiveness: true
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registers:
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- { id: 0, class: gr64 }
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- { id: 1, class: gr32 }
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- { id: 2, class: gr64 }
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- { id: 3, class: gr64 }
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- { id: 4, class: gr32 }
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- { id: 5, class: gr32 }
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- { id: 6, class: gr32 }
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- { id: 7, class: gr32 }
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liveins:
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- { reg: '$rdi', virtual-reg: '%2' }
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- { reg: '$esi', virtual-reg: '%4' }
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frameInfo:
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hasCalls: true
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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liveins: $rdi, $esi
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%4:gr32 = COPY $esi
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%2:gr64 = COPY $rdi
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%3:gr64 = COPY killed %2
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%5:gr32 = COPY killed %4
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DBG_VALUE %5, $noreg, !9, !DIExpression(), debug-location !16
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JMP_1 %bb.3
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bb.1.bb1:
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DBG_VALUE %5, $noreg, !9, !DIExpression(), debug-location !16
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JMP_1 %bb.4
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bb.2.bb2:
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DBG_VALUE %6, $noreg, !14, !DIExpression(), debug-location !17
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ADJCALLSTACKDOWN64 0, 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !19
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$edi = COPY %6, debug-location !19
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$al = MOV8ri 0, debug-location !19
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CALL64pcrel32 @foo, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit $edi, implicit-def $eax, debug-location !19
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ADJCALLSTACKUP64 0, 0, implicit-def $rsp, implicit-def $eflags, implicit-def $ssp, implicit $rsp, implicit $ssp, debug-location !19
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%7:gr32 = COPY $eax, debug-location !19
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JMP_1 %bb.1
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bb.3.bb3:
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%6:gr32 = MOV32rm %3, 1, $noreg, 0, $noreg, debug-location !17 :: (load 4 from %ir.tmp1)
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JMP_1 %bb.2
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bb.4.exit:
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$eax = COPY %5, debug-location !18
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RETQ implicit $eax, debug-location !18
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...
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