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Revert r313400 "[DebugInfo] Insert DW_OP_deref when spilling indirect DBG_VALUEs" 

This caused asserts in Chromium. See http://crbug.com/766261

> Summary:
> This comes up in optimized debug info for C++ programs that pass and
> return objects indirectly by address. In these programs,
> llvm.dbg.declare survives optimization, which causes us to emit indirect
> DBG_VALUE instructions. The fast register allocator knows to insert
> DW_OP_deref when spilling indirect DBG_VALUE instructions, but the
> LiveDebugVariables did not until this change.
>
> This fixes part of PR34513. I need to look into why this doesn't work at
> -O0 and I'll send follow up patches to handle that.
>
> Reviewers: aprantl, dblaikie, probinson
>
> Subscribers: qcolombet, hiraditya, llvm-commits
>
> Differential Revision: https://reviews.llvm.org/D37911

llvm-svn: 313589
This commit is contained in:
Hans Wennborg 2017-09-18 23:08:42 +00:00
parent 34a0dd5283
commit 4de620ab3d
4 changed files with 38 additions and 248 deletions
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88
llvm/lib/CodeGen/LiveDebugVariables.cpp
View File

@ -108,8 +108,8 @@ class LDVImpl;
/// held by the same virtual register. The equivalence class is the transitive
/// closure of that relation.
class UserValue {
const DILocalVariable *Variable; ///< The debug info variable we are part of.
const DIExpression *Expression; ///< Any complex address expression.
const MDNode *Variable; ///< The debug info variable we are part of.
const MDNode *Expression; ///< Any complex address expression.
bool IsIndirect; ///< true if this is a register-indirect+offset value.
DebugLoc dl; ///< The debug location for the variable. This is
///< used by dwarf writer to find lexical scope.
@ -132,9 +132,8 @@ class UserValue {
void coalesceLocation(unsigned LocNo);
/// insertDebugValue - Insert a DBG_VALUE into MBB at Idx for LocNo.
void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
unsigned LocNo, bool Spilled, LiveIntervals &LIS,
const TargetInstrInfo &TII);
void insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx, unsigned LocNo,
LiveIntervals &LIS, const TargetInstrInfo &TII);
/// splitLocation - Replace OldLocNo ranges with NewRegs ranges where NewRegs
/// is live. Returns true if any changes were made.
@ -143,8 +142,8 @@ class UserValue {
public:
/// UserValue - Create a new UserValue.
UserValue(const DILocalVariable *var, const DIExpression *expr, bool i,
DebugLoc L, LocMap::Allocator &alloc)
UserValue(const MDNode *var, const MDNode *expr, bool i, DebugLoc L,
LocMap::Allocator &alloc)
: Variable(var), Expression(expr), IsIndirect(i), dl(std::move(L)),
leader(this), locInts(alloc) {}
@ -160,8 +159,8 @@ public:
UserValue *getNext() const { return next; }
/// match - Does this UserValue match the parameters?
bool match(const DILocalVariable *Var, const DIExpression *Expr,
const DILocation *IA, bool indirect) const {
bool match(const MDNode *Var, const MDNode *Expr, const DILocation *IA,
bool indirect) const {
return Var == Variable && Expr == Expression && dl->getInlinedAt() == IA &&
indirect == IsIndirect;
}
@ -265,14 +264,12 @@ public:
LiveIntervals &LIS);
/// rewriteLocations - Rewrite virtual register locations according to the
/// provided virtual register map. Record which locations were spilled.
void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI,
BitVector &SpilledLocations);
/// provided virtual register map.
void rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI);
/// emitDebugValues - Recreate DBG_VALUE instruction from data structures.
void emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
const TargetInstrInfo &TRI,
const BitVector &SpilledLocations);
void emitDebugValues(VirtRegMap *VRM,
LiveIntervals &LIS, const TargetInstrInfo &TRI);
/// getDebugLoc - Return DebugLoc of this UserValue.
DebugLoc getDebugLoc() { return dl;}
@ -302,11 +299,11 @@ class LDVImpl {
VRMap virtRegToEqClass;
/// Map user variable to eq class leader.
using UVMap = DenseMap<const DILocalVariable *, UserValue *>;
using UVMap = DenseMap<const MDNode *, UserValue *>;
UVMap userVarMap;
/// getUserValue - Find or create a UserValue.
UserValue *getUserValue(const DILocalVariable *Var, const DIExpression *Expr,
UserValue *getUserValue(const MDNode *Var, const MDNode *Expr,
bool IsIndirect, const DebugLoc &DL);
/// lookupVirtReg - Find the EC leader for VirtReg or null.
@ -459,9 +456,8 @@ void UserValue::mapVirtRegs(LDVImpl *LDV) {
LDV->mapVirtReg(locations[i].getReg(), this);
}
UserValue *LDVImpl::getUserValue(const DILocalVariable *Var,
const DIExpression *Expr, bool IsIndirect,
const DebugLoc &DL) {
UserValue *LDVImpl::getUserValue(const MDNode *Var, const MDNode *Expr,
bool IsIndirect, const DebugLoc &DL) {
UserValue *&Leader = userVarMap[Var];
if (Leader) {
UserValue *UV = Leader->getLeader();
@ -500,11 +496,11 @@ bool LDVImpl::handleDebugValue(MachineInstr &MI, SlotIndex Idx) {
}
// Get or create the UserValue for (variable,offset).
bool IsIndirect = MI.getOperand(1).isImm();
bool IsIndirect = MI.isIndirectDebugValue();
if (IsIndirect)
assert(MI.getOperand(1).getImm() == 0 && "DBG_VALUE with nonzero offset");
const DILocalVariable *Var = MI.getDebugVariable();
const DIExpression *Expr = MI.getDebugExpression();
const MDNode *Var = MI.getDebugVariable();
const MDNode *Expr = MI.getDebugExpression();
//here.
UserValue *UV = getUserValue(Var, Expr, IsIndirect, MI.getDebugLoc());
UV->addDef(Idx, MI.getOperand(0));
@ -977,10 +973,8 @@ splitRegister(unsigned OldReg, ArrayRef<unsigned> NewRegs, LiveIntervals &LIS) {
static_cast<LDVImpl*>(pImpl)->splitRegister(OldReg, NewRegs);
}
void UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI,
BitVector &SpilledLocations) {
SpilledLocations.resize(locations.size());
void
UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI) {
// Iterate over locations in reverse makes it easier to handle coalescing.
for (unsigned i = locations.size(); i ; --i) {
unsigned LocNo = i-1;
@ -999,7 +993,6 @@ void UserValue::rewriteLocations(VirtRegMap &VRM, const TargetRegisterInfo &TRI,
} else if (VRM.getStackSlot(VirtReg) != VirtRegMap::NO_STACK_SLOT) {
// FIXME: Translate SubIdx to a stackslot offset.
Loc = MachineOperand::CreateFI(VRM.getStackSlot(VirtReg));
SpilledLocations.set(LocNo);
} else {
Loc.setReg(0);
Loc.setSubReg(0);
@ -1033,7 +1026,7 @@ findInsertLocation(MachineBasicBlock *MBB, SlotIndex Idx,
}
void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
unsigned LocNo, bool Spilled,
unsigned LocNo,
LiveIntervals &LIS,
const TargetInstrInfo &TII) {
MachineBasicBlock::iterator I = findInsertLocation(MBB, Idx, LIS);
@ -1043,35 +1036,25 @@ void UserValue::insertDebugValue(MachineBasicBlock *MBB, SlotIndex Idx,
assert(cast<DILocalVariable>(Variable)
->isValidLocationForIntrinsic(getDebugLoc()) &&
"Expected inlined-at fields to agree");
// If the location was spilled, the new DBG_VALUE will be indirect. If the
// original DBG_VALUE was indirect, we need to add DW_OP_deref to indicate
// that the original virtual register was a pointer.
bool NewIndirect = IsIndirect || Spilled;
const DIExpression *Expr = Expression;
if (Spilled && IsIndirect)
Expr = DIExpression::prepend(Expr, DIExpression::WithDeref);
MachineInstrBuilder MIB =
BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
.add(Loc);
if (NewIndirect)
MIB.addImm(0U);
if (Loc.isReg())
BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE),
IsIndirect, Loc.getReg(), Variable, Expression);
else
MIB.addReg(0U, RegState::Debug);
MIB.addMetadata(Variable).addMetadata(Expr);
BuildMI(*MBB, I, getDebugLoc(), TII.get(TargetOpcode::DBG_VALUE))
.add(Loc)
.addImm(0U)
.addMetadata(Variable)
.addMetadata(Expression);
}
void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
const TargetInstrInfo &TII,
const BitVector &SpilledLocations) {
const TargetInstrInfo &TII) {
MachineFunction::iterator MFEnd = VRM->getMachineFunction().end();
for (LocMap::const_iterator I = locInts.begin(); I.valid();) {
SlotIndex Start = I.start();
SlotIndex Stop = I.stop();
unsigned LocNo = I.value();
bool Spilled = LocNo != UndefLocNo ? SpilledLocations.test(LocNo) : false;
// If the interval start was trimmed to the lexical scope insert the
// DBG_VALUE at the previous index (otherwise it appears after the
@ -1084,7 +1067,7 @@ void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
SlotIndex MBBEnd = LIS.getMBBEndIdx(&*MBB);
DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
insertDebugValue(&*MBB, Start, LocNo, Spilled, LIS, TII);
insertDebugValue(&*MBB, Start, LocNo, LIS, TII);
// This interval may span multiple basic blocks.
// Insert a DBG_VALUE into each one.
while(Stop > MBBEnd) {
@ -1094,7 +1077,7 @@ void UserValue::emitDebugValues(VirtRegMap *VRM, LiveIntervals &LIS,
break;
MBBEnd = LIS.getMBBEndIdx(&*MBB);
DEBUG(dbgs() << " BB#" << MBB->getNumber() << '-' << MBBEnd);
insertDebugValue(&*MBB, Start, LocNo, Spilled, LIS, TII);
insertDebugValue(&*MBB, Start, LocNo, LIS, TII);
}
DEBUG(dbgs() << '\n');
if (MBB == MFEnd)
@ -1109,11 +1092,10 @@ void LDVImpl::emitDebugValues(VirtRegMap *VRM) {
if (!MF)
return;
const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
BitVector SpilledLocations;
for (unsigned i = 0, e = userValues.size(); i != e; ++i) {
DEBUG(userValues[i]->print(dbgs(), TRI));
userValues[i]->rewriteLocations(*VRM, *TRI, SpilledLocations);
userValues[i]->emitDebugValues(VRM, *LIS, *TII, SpilledLocations);
userValues[i]->rewriteLocations(*VRM, *TRI);
userValues[i]->emitDebugValues(VRM, *LIS, *TII);
}
EmitDone = true;
}

6
llvm/test/DebugInfo/X86/bbjoin.ll
View File

@ -11,12 +11,12 @@
; }
; CHECK: ![[X:.*]] = !DILocalVariable(name: "x",
; CHECK: bb.0.entry:
; CHECK: DBG_VALUE 23, debug-use _, ![[X]],
; CHECK: DBG_VALUE 23, 0, ![[X]],
; CHECK: DBG_VALUE %rsp, 0, ![[X]], !DIExpression(DW_OP_plus_uconst, 4, DW_OP_deref),
; CHECK: bb.1.if.then:
; CHECK: DBG_VALUE 43, debug-use _, ![[X]],
; CHECK: DBG_VALUE 43, 0, ![[X]],
; CHECK: bb.2.if.end:
; CHECK-NOT: DBG_VALUE 23, debug-use _, ![[X]],
; CHECK-NOT: DBG_VALUE 23, 0, ![[X]],
; CHECK: RETQ %eax
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"

103
llvm/test/DebugInfo/X86/spill-indirect-nrvo.ll
View File

@ -1,103 +0,0 @@
; RUN: llc < %s | FileCheck %s
; RUN: llc -O0 < %s | FileCheck %s
; Make sure we insert DW_OP_deref when spilling indirect DBG_VALUE instructions.
; C++ source:
; #define FORCE_SPILL() \
; __asm volatile("" : : : \
; "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
; "r9", "r10", "r11", "r12", "r13", "r14", "r15")
; struct string {
; string();
; string(int i);
; ~string();
; int i = 0;
; };
; string get_string() {
; string result = 3;
; FORCE_SPILL();
; return result;
; }
; CHECK-LABEL: _Z10get_stringv:
; CHECK: #DEBUG_VALUE: get_string:result <- [%RDI+0]
; CHECK: movq %rdi, [[OFFS:[0-9]+]](%rsp) # 8-byte Spill
; CHECK: #DEBUG_VALUE: get_string:result <- [DW_OP_plus_uconst [[OFFS]], DW_OP_deref] [%RSP+0]
; CHECK: callq _ZN6stringC1Ei
; CHECK: #APP
; CHECK: #NO_APP
; ModuleID = 't.cpp'
source_filename = "t.cpp"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
%struct.string = type { i32 }
; Function Attrs: uwtable
define void @_Z10get_stringv(%struct.string* noalias sret %agg.result) #0 !dbg !7 {
entry:
%nrvo = alloca i1, align 1
store i1 false, i1* %nrvo, align 1, !dbg !24
call void @llvm.dbg.declare(metadata %struct.string* %agg.result, metadata !23, metadata !DIExpression()), !dbg !25
call void @_ZN6stringC1Ei(%struct.string* %agg.result, i32 3), !dbg !26
call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #3, !dbg !27, !srcloc !28
store i1 true, i1* %nrvo, align 1, !dbg !29
%nrvo.val = load i1, i1* %nrvo, align 1, !dbg !30
br i1 %nrvo.val, label %nrvo.skipdtor, label %nrvo.unused, !dbg !30
nrvo.unused: ; preds = %entry
call void @_ZN6stringD1Ev(%struct.string* %agg.result), !dbg !30
br label %nrvo.skipdtor, !dbg !30
nrvo.skipdtor: ; preds = %nrvo.unused, %entry
ret void, !dbg !30
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_ZN6stringC1Ei(%struct.string*, i32) unnamed_addr
declare void @_ZN6stringD1Ev(%struct.string*) unnamed_addr
attributes #0 = { uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 6.0.0 "}
!7 = distinct !DISubprogram(name: "get_string", linkageName: "_Z10get_stringv", scope: !1, file: !1, line: 13, type: !8, isLocal: false, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !22)
!8 = !DISubroutineType(types: !9)
!9 = !{!10}
!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "string", file: !1, line: 7, size: 32, elements: !11, identifier: "_ZTS6string")
!11 = !{!12, !14, !18, !21}
!12 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !10, file: !1, line: 11, baseType: !13, size: 32)
!13 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!14 = !DISubprogram(name: "string", scope: !10, file: !1, line: 8, type: !15, isLocal: false, isDefinition: false, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true)
!15 = !DISubroutineType(types: !16)
!16 = !{null, !17}
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!18 = !DISubprogram(name: "string", scope: !10, file: !1, line: 9, type: !19, isLocal: false, isDefinition: false, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: true)
!19 = !DISubroutineType(types: !20)
!20 = !{null, !17, !13}
!21 = !DISubprogram(name: "~string", scope: !10, file: !1, line: 10, type: !15, isLocal: false, isDefinition: false, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: true)
!22 = !{!23}
!23 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 14, type: !10)
!24 = !DILocation(line: 14, column: 3, scope: !7)
!25 = !DILocation(line: 14, column: 10, scope: !7)
!26 = !DILocation(line: 14, column: 19, scope: !7)
!27 = !DILocation(line: 15, column: 3, scope: !7)
!28 = !{i32 -2147471175}
!29 = !DILocation(line: 16, column: 3, scope: !7)
!30 = !DILocation(line: 17, column: 1, scope: !7)

89
llvm/test/DebugInfo/X86/spill-nontrivial-param.ll
View File

@ -1,89 +0,0 @@
; RUN: llc < %s | FileCheck %s
; Make sure we insert DW_OP_deref when spilling indirect DBG_VALUE instructions.
; In this example, 'nt' is passed by address because it is not trivially
; copyable. When we spill the physical argument register at the barrier, we need
; to insert DW_OP_deref.
; #define FORCE_SPILL() \
; __asm volatile("" : : : \
; "rax", "rbx", "rcx", "rdx", "rsi", "rdi", "rbp", "r8", \
; "r9", "r10", "r11", "r12", "r13", "r14", "r15")
; struct NonTrivial {
; NonTrivial();
; ~NonTrivial();
; int i;
; };
; int foo(NonTrivial nt) {
; FORCE_SPILL();
; return nt.i;
; }
; CHECK-LABEL: _Z3foo10NonTrivial:
; CHECK: #DEBUG_VALUE: foo:nt <- [%RDI+0]
; CHECK: movq %rdi, -8(%rsp) # 8-byte Spill
; CHECK: #DEBUG_VALUE: foo:nt <- [DW_OP_constu 8, DW_OP_minus, DW_OP_deref] [%RSP+0]
; CHECK: #APP
; CHECK: #NO_APP
; CHECK: movq -8(%rsp), %rax # 8-byte Reload
; CHECK: movl (%rax), %eax
; ModuleID = 't.cpp'
source_filename = "t.cpp"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64--linux"
%struct.NonTrivial = type { i32 }
; Function Attrs: nounwind uwtable
define i32 @_Z3foo10NonTrivial(%struct.NonTrivial* nocapture readonly %nt) local_unnamed_addr #0 !dbg !7 {
entry:
tail call void @llvm.dbg.declare(metadata %struct.NonTrivial* %nt, metadata !20, metadata !DIExpression()), !dbg !21
tail call void asm sideeffect "", "~{rax},~{rbx},~{rcx},~{rdx},~{rsi},~{rdi},~{rbp},~{r8},~{r9},~{r10},~{r11},~{r12},~{r13},~{r14},~{r15},~{dirflag},~{fpsr},~{flags}"() #2, !dbg !22, !srcloc !23
%i = getelementptr inbounds %struct.NonTrivial, %struct.NonTrivial* %nt, i64 0, i32 0, !dbg !24
%0 = load i32, i32* %i, align 4, !dbg !24, !tbaa !25
ret i32 %0, !dbg !30
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5}
!llvm.ident = !{!6}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "t.cpp", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{!"clang version 6.0.0 "}
!7 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foo10NonTrivial", scope: !1, file: !1, line: 10, type: !8, isLocal: false, isDefinition: true, scopeLine: 10, flags: DIFlagPrototyped, isOptimized: true, unit: !0, variables: !19)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !11}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "NonTrivial", file: !1, line: 5, size: 32, elements: !12, identifier: "_ZTS10NonTrivial")
!12 = !{!13, !14, !18}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 8, baseType: !10, size: 32)
!14 = !DISubprogram(name: "NonTrivial", scope: !11, file: !1, line: 6, type: !15, isLocal: false, isDefinition: false, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true)
!15 = !DISubroutineType(types: !16)
!16 = !{null, !17}
!17 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !11, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!18 = !DISubprogram(name: "~NonTrivial", scope: !11, file: !1, line: 7, type: !15, isLocal: false, isDefinition: false, scopeLine: 7, flags: DIFlagPrototyped, isOptimized: true)
!19 = !{!20}
!20 = !DILocalVariable(name: "nt", arg: 1, scope: !7, file: !1, line: 10, type: !11)
!21 = !DILocation(line: 10, column: 20, scope: !7)
!22 = !DILocation(line: 11, column: 3, scope: !7)
!23 = !{i32 -2147471481}
!24 = !DILocation(line: 12, column: 13, scope: !7)
!25 = !{!26, !27, i64 0}
!26 = !{!"_ZTS10NonTrivial", !27, i64 0}
!27 = !{!"int", !28, i64 0}
!28 = !{!"omnipotent char", !29, i64 0}
!29 = !{!"Simple C++ TBAA"}
!30 = !DILocation(line: 12, column: 3, scope: !7)