133 lines
5.9 KiB
LLVM
133 lines
5.9 KiB
LLVM
; RUN: opt < %s -S -simplifycfg | FileCheck %s
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; Note: This patch fixes the regression introduced by pr38762.
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;
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; When SimplifyCFG changes the PHI node into a select instruction, the debug
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; information becomes ambiguous. It causes the debugger to display unreached
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; lines and invalid variable values.
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;
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; When the function 'hoistAllInstructionsInto' hoist a basic block:
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; - Remove their dbg.values.
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; - Set their debug locations to the values from the insertion point.
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;
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; But, if one of the instructions being hoisted is a debug intrinsic from an
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; inlined function, assigning it the debug location from the insertion point
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; will create a mismatch between the intrinsic's subprogram and the location's
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; subprogram, causing the assertion "Expected inlined-at fields to agree" in
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; SelectionDAG".
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; IR generated with:
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; clang -S -g -gno-column-info -O2 -emit-llvm pr39243.cpp -o pr39243.ll -mllvm -opt-bisect-limit=103
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; // pr39243.cpp
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; union onion {
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; double dd;
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; int ii[2];
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; };
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;
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; int alpha;
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; int bravo();
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;
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; int charlie() {
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; int delta = 0;
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; return bravo();
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; }
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;
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; int echo(onion foxtrot) {
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; alpha = foxtrot.ii[0];
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; if (alpha) {
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; int golf = bravo();
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; return -golf;
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; }
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; alpha = foxtrot.ii[1];
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; return -charlie();
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; }
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; Change the debug locations associated with the PHI nodes being promoted, to
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; the debug locations from the insertion point in the dominant block.
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; CHECK-LABEL: entry
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; CHECK: %foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32
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; CHECK: %tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
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; CHECK: %foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34
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; CHECK: %foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32
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; CHECK: store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !25
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; CHECK-NOT: call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43
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; ModuleID = 'pr39243.cpp'
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source_filename = "pr39243.cpp"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-linux-gnu"
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@alpha = dso_local local_unnamed_addr global i32 0, align 4, !dbg !0
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define dso_local i32 @_Z7charliev() local_unnamed_addr #0 {
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entry:
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%call = tail call i32 @_Z5bravov()
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ret i32 %call
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}
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declare dso_local i32 @_Z5bravov() local_unnamed_addr #1
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define dso_local i32 @_Z4echo5onion(i64 %foxtrot.coerce) local_unnamed_addr #0 !dbg !18 {
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entry:
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%foxtrot.sroa.0.0.extract.trunc = trunc i64 %foxtrot.coerce to i32
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store i32 %foxtrot.sroa.0.0.extract.trunc, i32* @alpha, align 4
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%tobool = icmp eq i32 %foxtrot.sroa.0.0.extract.trunc, 0
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br i1 %tobool, label %if.end, label %return
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if.end: ; preds = %entry
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%foxtrot.sroa.2.0.extract.shift = lshr i64 %foxtrot.coerce, 32
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%foxtrot.sroa.2.0.extract.trunc = trunc i64 %foxtrot.sroa.2.0.extract.shift to i32
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call void @llvm.dbg.value(metadata i32 %foxtrot.sroa.2.0.extract.trunc, metadata !30, metadata !DIExpression(DW_OP_LLVM_fragment, 32, 32)), !dbg !34
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store i32 %foxtrot.sroa.2.0.extract.trunc, i32* @alpha, align 4, !dbg !42
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call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !DIExpression()), !dbg !43
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br label %return
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return: ; preds = %entry, %if.end
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%call.i = tail call i32 @_Z5bravov()
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%retval.0 = sub nsw i32 0, %call.i
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ret i32 %retval.0
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}
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!7, !8, !9}
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!llvm.ident = !{!10}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "alpha", scope: !2, file: !3, line: 6, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 8.0.0 (trunk 344502)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5, nameTableKind: None)
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!3 = !DIFile(filename: "pr39243.cpp", directory: ".")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 4}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!9 = !{i32 1, !"wchar_size", i32 4}
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!10 = !{!"clang version 8.0.0 (trunk 344502)"}
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!11 = distinct !DISubprogram(name: "charlie", linkageName: "_Z7charliev", scope: !3, file: !3, line: 9, type: !12, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !14)
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!12 = !DISubroutineType(types: !13)
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!13 = !{!6}
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!14 = !{!15}
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!15 = !DILocalVariable(name: "delta", scope: !11, file: !3, line: 10, type: !6)
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!18 = distinct !DISubprogram(name: "echo", linkageName: "_Z4echo5onion", scope: !3, file: !3, line: 14, type: !19, isLocal: false, isDefinition: true, scopeLine: 14, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !29)
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!19 = !DISubroutineType(types: !20)
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!20 = !{!6, !21}
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!21 = distinct !DICompositeType(tag: DW_TAG_union_type, name: "onion", file: !3, line: 1, size: 64, flags: DIFlagTypePassByValue, elements: !22, identifier: "_ZTS5onion")
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!22 = !{!23, !25}
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!23 = !DIDerivedType(tag: DW_TAG_member, name: "dd", scope: !21, file: !3, line: 2, baseType: !24, size: 64)
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!24 = !DIBasicType(name: "double", size: 64, encoding: DW_ATE_float)
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!25 = !DIDerivedType(tag: DW_TAG_member, name: "ii", scope: !21, file: !3, line: 3, baseType: !26, size: 64)
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!26 = !DICompositeType(tag: DW_TAG_array_type, baseType: !6, size: 64, elements: !27)
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!27 = !{!28}
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!28 = !DISubrange(count: 2)
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!29 = !{!30}
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!30 = !DILocalVariable(name: "foxtrot", arg: 1, scope: !18, file: !3, line: 14, type: !21)
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!34 = !DILocation(line: 14, scope: !18)
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!42 = !DILocation(line: 20, scope: !18)
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!43 = !DILocation(line: 10, scope: !11, inlinedAt: !44)
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!44 = distinct !DILocation(line: 21, scope: !18)
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