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Reapply "[DebugInfo] Fix updateDbgUsersToReg to support DBG_VALUE_LIST"
Previous crashes caused by this patch were the result of machine subregisters being incorrectly handled in updateDbgUsersToReg; this has been fixed by using RegUnits to determine overlapping registers, instead of using the register values directly. Differential Revision: https://reviews.llvm.org/D101523 This reverts commit 7ca26c5fa2df253878cab22e1e2f0d6f1b481218.
This commit is contained in:
Stephen Tozer
parent
5d49c0c0e7
commit
e0ba9acd2a
@ -823,12 +823,27 @@ public:
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/// updateDbgUsersToReg - Update a collection of DBG_VALUE instructions
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/// to refer to the designated register.
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void updateDbgUsersToReg(Register Reg,
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ArrayRef<MachineInstr*> Users) const {
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void updateDbgUsersToReg(MCRegister OldReg, MCRegister NewReg,
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ArrayRef<MachineInstr *> Users) const {
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SmallSet<MCRegister, 4> OldRegUnits;
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for (MCRegUnitIterator RUI(OldReg, getTargetRegisterInfo()); RUI.isValid();
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++RUI)
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OldRegUnits.insert(*RUI);
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for (MachineInstr *MI : Users) {
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assert(MI->isDebugInstr());
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assert(MI->getOperand(0).isReg());
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MI->getOperand(0).setReg(Reg);
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assert(MI->isDebugValue());
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for (auto &Op : MI->debug_operands()) {
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if (Op.isReg()) {
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for (MCRegUnitIterator RUI(OldReg, getTargetRegisterInfo());
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RUI.isValid(); ++RUI) {
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if (OldRegUnits.contains(*RUI)) {
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Op.setReg(NewReg);
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break;
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}
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}
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}
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}
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assert(MI->hasDebugOperandForReg(NewReg) &&
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"Expected debug value to have some overlap with OldReg");
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}
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}
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@ -294,7 +294,7 @@ private:
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SmallSetVector<MachineInstr *, 8> MaybeDeadCopies;
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/// Multimap tracking debug users in current BB
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DenseMap<MachineInstr*, SmallVector<MachineInstr*, 2>> CopyDbgUsers;
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DenseMap<MachineInstr *, SmallSet<MachineInstr *, 2>> CopyDbgUsers;
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CopyTracker Tracker;
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@ -321,7 +321,7 @@ void MachineCopyPropagation::ReadRegister(MCRegister Reg, MachineInstr &Reader,
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LLVM_DEBUG(dbgs() << "MCP: Copy is used - not dead: "; Copy->dump());
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MaybeDeadCopies.remove(Copy);
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} else {
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CopyDbgUsers[Copy].push_back(&Reader);
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CopyDbgUsers[Copy].insert(&Reader);
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}
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}
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}
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@ -734,7 +734,11 @@ void MachineCopyPropagation::ForwardCopyPropagateBlock(MachineBasicBlock &MBB) {
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// Update matching debug values, if any.
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assert(MaybeDead->isCopy());
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Register SrcReg = MaybeDead->getOperand(1).getReg();
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MRI->updateDbgUsersToReg(SrcReg, CopyDbgUsers[MaybeDead]);
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Register DestReg = MaybeDead->getOperand(0).getReg();
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SmallVector<MachineInstr *> MaybeDeadDbgUsers(
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CopyDbgUsers[MaybeDead].begin(), CopyDbgUsers[MaybeDead].end());
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MRI->updateDbgUsersToReg(DestReg.asMCReg(), SrcReg.asMCReg(),
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MaybeDeadDbgUsers);
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MaybeDead->eraseFromParent();
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Changed = true;
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199
test/DebugInfo/ARM/machine-cp-updates-dbg-reg.mir
Normal file
199
test/DebugInfo/ARM/machine-cp-updates-dbg-reg.mir
Normal file
@ -0,0 +1,199 @@
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# RUN: llc %s -run-pass=machine-cp -o - | FileCheck %s --implicit-check-not=DBG_VALUE
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## Ensure that when the destination register of a copy instruction is used by a
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## DBG_VALUE/DBG_VALUE_LIST, and then that instruction is deleted during copy
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## propagation, the debug use is updated to the source register.
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# CHECK: ![[VAR_V:[0-9]+]] = !DILocalVariable(name: "v"
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# CHECK-LABEL: body:
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# CHECK: DBG_VALUE $r0, $noreg, ![[VAR_V]], !DIExpression()
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# CHECK: DBG_VALUE_LIST ![[VAR_V]], !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value), $r0, 0
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--- |
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target datalayout = "e-m:e-p:32:32-Fi8-i64:64-v128:64:128-a:0:32-n32-S64"
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target triple = "arm-unknown-linux-gnueabi"
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%struct.atomic_t.0.6.15.24.48.51.54.57 = type { i32 }
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%struct.mm_struct.2.8.17.26.50.53.56.59 = type { %struct.anon.1.7.16.25.49.52.55.58 }
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%struct.anon.1.7.16.25.49.52.55.58 = type { i32 }
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@dup_mm_err = external dso_local local_unnamed_addr global i32, align 4, !dbg !0
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declare dso_local i32 @atomic_long_read(%struct.atomic_t.0.6.15.24.48.51.54.57*) local_unnamed_addr #0
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declare dso_local i32 @get_mm_counter(%struct.mm_struct.2.8.17.26.50.53.56.59*, i32) local_unnamed_addr #0
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define dso_local i32 @dup_mm() local_unnamed_addr !dbg !16 {
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entry:
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%call = tail call i32 bitcast (i32 (...)* @kmem_cache_alloc to i32 (i32)*)(i32 0)
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br i1 undef, label %cleanup, label %if.end
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if.end: ; preds = %entry
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%tobool1.not = icmp eq i32 undef, 0
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br i1 %tobool1.not, label %if.end3, label %free_pt
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if.end3: ; preds = %if.end
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call void @llvm.dbg.value(metadata !DIArgList(i32 %call, i32 0), metadata !30, metadata !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value)), !dbg !40
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%0 = load volatile i32, i32* undef, align 4
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br label %cleanup
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free_pt: ; preds = %if.end
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store i32 0, i32* undef, align 4
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br label %cleanup
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cleanup: ; preds = %free_pt, %if.end3, %entry
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%retval.0 = phi i32 [ %call, %if.end3 ], [ 0, %entry ], [ 0, %free_pt ]
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ret i32 %retval.0
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}
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declare dso_local i32 @kmem_cache_alloc(...) local_unnamed_addr
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declare void @llvm.dbg.label(metadata)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!14, !15}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "dup_mm_err", scope: !2, file: !3, line: 5, type: !12, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 13.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, retainedTypes: !9, globals: !13, splitDebugInlining: false, nameTableKind: None)
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!3 = !DIFile(filename: "machine-cp-updates-dbg-reg.ll", directory: "/")
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!4 = !{!5}
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!5 = !DICompositeType(tag: DW_TAG_enumeration_type, file: !3, line: 4, baseType: !6, size: 32, elements: !7)
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!6 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!7 = !{!8}
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!8 = !DIEnumerator(name: "MM_SHMEMPAGES", value: 0, isUnsigned: true)
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!9 = !{!10}
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!10 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 32)
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!11 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !12)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !{!0}
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !{i32 1, !"min_enum_size", i32 4}
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!16 = distinct !DISubprogram(name: "dup_mm", scope: !3, file: !3, line: 14, type: !17, scopeLine: 14, flags: DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !19)
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!17 = !DISubroutineType(types: !18)
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!18 = !{!12}
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!19 = !{!20, !28, !29}
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!20 = !DILocalVariable(name: "mm", scope: !16, file: !3, line: 15, type: !21)
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!21 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !22, size: 32)
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!22 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "mm_struct", file: !3, line: 7, size: 32, elements: !23)
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!23 = !{!24}
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!24 = !DIDerivedType(tag: DW_TAG_member, scope: !22, file: !3, line: 8, baseType: !25, size: 32)
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!25 = distinct !DICompositeType(tag: DW_TAG_structure_type, scope: !22, file: !3, line: 8, size: 32, elements: !26)
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!26 = !{!27}
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!27 = !DIDerivedType(tag: DW_TAG_member, name: "binfmt", scope: !25, file: !3, line: 9, baseType: !12, size: 32)
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!28 = !DILabel(scope: !16, name: "free_pt", file: !3, line: 22)
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!29 = !DILabel(scope: !16, name: "fail_nomem", file: !3, line: 24)
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!30 = !DILocalVariable(name: "v", arg: 1, scope: !31, file: !3, line: 6, type: !34)
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!31 = distinct !DISubprogram(name: "atomic_long_read", scope: !3, file: !3, line: 6, type: !32, scopeLine: 6, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !39)
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!32 = !DISubroutineType(types: !33)
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!33 = !{!12, !34}
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!34 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !35, size: 32)
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!35 = !DIDerivedType(tag: DW_TAG_typedef, name: "atomic_t", file: !3, line: 3, baseType: !36)
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!36 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 32, elements: !37)
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!37 = !{!38}
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!38 = !DIDerivedType(tag: DW_TAG_member, name: "counter", scope: !36, file: !3, line: 2, baseType: !12, size: 32)
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!39 = !{!30}
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!40 = !DILocation(line: 0, scope: !31, inlinedAt: !41)
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!41 = distinct !DILocation(line: 12, column: 3, scope: !42, inlinedAt: !48)
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!42 = distinct !DISubprogram(name: "get_mm_counter", scope: !3, file: !3, line: 11, type: !43, scopeLine: 11, flags: DIFlagPrototyped | DIFlagAllCallsDescribed, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !2, retainedNodes: !45)
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!43 = !DISubroutineType(types: !44)
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!44 = !{!22, !21, !12}
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!45 = !{!46, !47}
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!46 = !DILocalVariable(name: "mm", arg: 1, scope: !42, file: !3, line: 11, type: !21)
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!47 = !DILocalVariable(name: "member", arg: 2, scope: !42, file: !3, line: 11, type: !12)
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!48 = distinct !DILocation(line: 20, column: 3, scope: !16)
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...
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---
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name: dup_mm
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alignment: 4
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exposesReturnsTwice: false
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legalized: false
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regBankSelected: false
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selected: false
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failedISel: false
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tracksRegLiveness: true
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hasWinCFI: false
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registers: []
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liveins: []
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frameInfo:
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isFrameAddressTaken: false
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isReturnAddressTaken: false
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hasStackMap: false
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hasPatchPoint: false
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stackSize: 8
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offsetAdjustment: 0
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maxAlignment: 4
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adjustsStack: true
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hasCalls: true
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stackProtector: ''
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maxCallFrameSize: 0
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cvBytesOfCalleeSavedRegisters: 0
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hasOpaqueSPAdjustment: false
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hasVAStart: false
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hasMustTailInVarArgFunc: false
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hasTailCall: false
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localFrameSize: 0
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savePoint: ''
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restorePoint: ''
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fixedStack: []
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stack:
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- { id: 0, name: '', type: spill-slot, offset: -4, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$lr', callee-saved-restored: false,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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- { id: 1, name: '', type: spill-slot, offset: -8, size: 4, alignment: 4,
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stack-id: default, callee-saved-register: '$r4', callee-saved-restored: true,
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debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
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callSites: []
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debugValueSubstitutions: []
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constants: []
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machineFunctionInfo: {}
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body: |
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bb.0.entry:
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successors: %bb.4(0x40000000), %bb.1(0x40000000)
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liveins: $r4, $lr
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$sp = frame-setup STMDB_UPD $sp, 14 /* CC::al */, $noreg, killed $r4, killed $lr
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frame-setup CFI_INSTRUCTION def_cfa_offset 8
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frame-setup CFI_INSTRUCTION offset $lr, -4
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frame-setup CFI_INSTRUCTION offset $r4, -8
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renamable $r4 = MOVi 0, 14 /* CC::al */, $noreg, $noreg
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$r0 = MOVi 0, 14 /* CC::al */, $noreg, $noreg
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BL @kmem_cache_alloc, csr_aapcs, implicit-def dead $lr, implicit $sp, implicit $r0, implicit-def $sp, implicit-def $r0
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CMPri renamable $r4, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
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Bcc %bb.4, 1 /* CC::ne */, killed $cpsr
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bb.1.if.end:
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successors: %bb.2(0x30000000), %bb.3(0x50000000)
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liveins: $r0
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renamable $r4 = MOVi 0, 14 /* CC::al */, $noreg, $noreg
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CMPri renamable $r4, 0, 14 /* CC::al */, $noreg, implicit-def $cpsr
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Bcc %bb.3, 1 /* CC::ne */, killed $cpsr
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bb.2.if.end3:
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liveins: $r0
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dead renamable $r1 = LDRi12 undef renamable $r0, 0, 14 /* CC::al */, $noreg :: (volatile load 4 from `i32* undef`)
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renamable $r4 = COPY killed renamable $r0
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DBG_VALUE $r4, $noreg, !30, !DIExpression(), debug-location !40
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DBG_VALUE_LIST !30, !DIExpression(DW_OP_LLVM_arg, 0, DW_OP_LLVM_arg, 1, DW_OP_constu, 4, DW_OP_mul, DW_OP_plus, DW_OP_stack_value), $r4, 0, debug-location !40
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$r0 = COPY killed renamable $r4
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$sp = frame-destroy LDMIA_RET $sp, 14 /* CC::al */, $noreg, def $r4, def $pc, implicit $r0
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bb.3.free_pt:
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successors: %bb.4(0x80000000)
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liveins: $r4
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STRi12 renamable $r4, undef renamable $r0, 0, 14 /* CC::al */, $noreg :: (store 4 into `i32* undef`)
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bb.4.cleanup:
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liveins: $r4
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$r0 = COPY killed renamable $r4
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$sp = frame-destroy LDMIA_RET $sp, 14 /* CC::al */, $noreg, def $r4, def $pc, implicit $r0
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...
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