const TargetLowering *TLI = MF->getSubtarget().getTargetLowering();
unsigned SP = TLI->getStackPointerRegisterToSaveRestore();
+ unsigned FrameReg = TRI->getFrameRegister(*MF);
RegDescribedVarsMap RegVars;
DbgValueEntriesMap LiveEntries;
for (const auto &MBB : *MF) {
for (auto I = RegVars.begin(), E = RegVars.end(); I != E;) {
auto CurElem = I++; // CurElem can be erased below.
if (TRI->isVirtualRegister(CurElem->first) ||
- ChangingRegs.test(CurElem->first))
+ ChangingRegs.test(CurElem->first) ||
+ CurElem->first == FrameReg)
clobberRegisterUses(RegVars, CurElem, DbgValues, LiveEntries,
MBB.back());
}
return VariableDie;
}
- // Check if variable is described by a DBG_VALUE instruction.
- if (const MachineInstr *DVInsn = DV.getMInsn()) {
- assert(DVInsn->getNumOperands() == 4);
- if (DVInsn->getOperand(0).isReg()) {
- auto RegOp = DVInsn->getOperand(0);
- auto Op1 = DVInsn->getOperand(1);
- // If the second operand is an immediate, this is an indirect value.
- assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
- MachineLocation Location(RegOp.getReg(), Op1.isImm());
- addVariableAddress(DV, *VariableDie, Location);
- } else if (DVInsn->getOperand(0).isImm()) {
- // This variable is described by a single constant.
- // Check whether it has a DIExpression.
+ // Check if variable has a single location description.
+ if (auto *DVal = DV.getValueLoc()) {
+ if (DVal->isLocation())
+ addVariableAddress(DV, *VariableDie, DVal->getLoc());
+ else if (DVal->isInt()) {
auto *Expr = DV.getSingleExpression();
if (Expr && Expr->getNumElements()) {
DIELoc *Loc = new (DIEValueAllocator) DIELoc;
DIEDwarfExpression DwarfExpr(*Asm, *this, *Loc);
// If there is an expression, emit raw unsigned bytes.
DwarfExpr.addFragmentOffset(Expr);
- DwarfExpr.addUnsignedConstant(DVInsn->getOperand(0).getImm());
+ DwarfExpr.addUnsignedConstant(DVal->getInt());
DwarfExpr.addExpression(Expr);
addBlock(*VariableDie, dwarf::DW_AT_location, DwarfExpr.finalize());
} else
- addConstantValue(*VariableDie, DVInsn->getOperand(0), DV.getType());
- } else if (DVInsn->getOperand(0).isFPImm())
- addConstantFPValue(*VariableDie, DVInsn->getOperand(0));
- else if (DVInsn->getOperand(0).isCImm())
- addConstantValue(*VariableDie, DVInsn->getOperand(0).getCImm(),
- DV.getType());
-
+ addConstantValue(*VariableDie, DVal->getInt(), DV.getType());
+ } else if (DVal->isConstantFP()) {
+ addConstantFPValue(*VariableDie, DVal->getConstantFP());
+ } else if (DVal->isConstantInt()) {
+ addConstantValue(*VariableDie, DVal->getConstantInt(), DV.getType());
+ }
return VariableDie;
}
return Ty;
}
+/// Get .debug_loc entry for the instruction range starting at MI.
+static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
+ const DIExpression *Expr = MI->getDebugExpression();
+ assert(MI->getNumOperands() == 4);
+ if (MI->getOperand(0).isReg()) {
+ auto RegOp = MI->getOperand(0);
+ auto Op1 = MI->getOperand(1);
+ // If the second operand is an immediate, this is a
+ // register-indirect address.
+ assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
+ MachineLocation MLoc(RegOp.getReg(), Op1.isImm());
+ return DebugLocEntry::Value(Expr, MLoc);
+ }
+ if (MI->getOperand(0).isImm())
+ return DebugLocEntry::Value(Expr, MI->getOperand(0).getImm());
+ if (MI->getOperand(0).isFPImm())
+ return DebugLocEntry::Value(Expr, MI->getOperand(0).getFPImm());
+ if (MI->getOperand(0).isCImm())
+ return DebugLocEntry::Value(Expr, MI->getOperand(0).getCImm());
+
+ llvm_unreachable("Unexpected 4-operand DBG_VALUE instruction!");
+}
+
+void DbgVariable::initializeDbgValue(const MachineInstr *DbgValue) {
+ assert(FrameIndexExprs.empty() && "Already initialized?");
+ assert(!ValueLoc.get() && "Already initialized?");
+
+ assert(getVariable() == DbgValue->getDebugVariable() && "Wrong variable");
+ assert(getInlinedAt() == DbgValue->getDebugLoc()->getInlinedAt() &&
+ "Wrong inlined-at");
+
+ ValueLoc = llvm::make_unique<DebugLocEntry::Value>(getDebugLocValue(DbgValue));
+ if (auto *E = DbgValue->getDebugExpression())
+ if (E->getNumElements())
+ FrameIndexExprs.push_back({0, E});
+}
+
ArrayRef<DbgVariable::FrameIndexExpr> DbgVariable::getFrameIndexExprs() const {
if (FrameIndexExprs.size() == 1)
return FrameIndexExprs;
}
void DbgVariable::addMMIEntry(const DbgVariable &V) {
- assert(DebugLocListIndex == ~0U && !MInsn && "not an MMI entry");
- assert(V.DebugLocListIndex == ~0U && !V.MInsn && "not an MMI entry");
+ assert(DebugLocListIndex == ~0U && !ValueLoc.get() && "not an MMI entry");
+ assert(V.DebugLocListIndex == ~0U && !V.ValueLoc.get() && "not an MMI entry");
assert(V.getVariable() == getVariable() && "conflicting variable");
assert(V.getInlinedAt() == getInlinedAt() && "conflicting inlined-at location");
}
}
-// Get .debug_loc entry for the instruction range starting at MI.
-static DebugLocEntry::Value getDebugLocValue(const MachineInstr *MI) {
- const DIExpression *Expr = MI->getDebugExpression();
- assert(MI->getNumOperands() == 4);
- if (MI->getOperand(0).isReg()) {
- auto RegOp = MI->getOperand(0);
- auto Op1 = MI->getOperand(1);
- // If the second operand is an immediate, this is a
- // register-indirect address.
- assert((!Op1.isImm() || (Op1.getImm() == 0)) && "unexpected offset");
- MachineLocation MLoc(RegOp.getReg(), Op1.isImm());
- return DebugLocEntry::Value(Expr, MLoc);
+/// Determine whether a *singular* DBG_VALUE is valid for the entirety of its
+/// enclosing lexical scope. The check ensures there are no other instructions
+/// in the same lexical scope preceding the DBG_VALUE and that its range is
+/// either open or otherwise rolls off the end of the scope.
+static bool validThroughout(LexicalScopes &LScopes,
+ const MachineInstr *DbgValue,
+ const MachineInstr *RangeEnd) {
+ assert(DbgValue->getDebugLoc() && "DBG_VALUE without a debug location");
+ auto MBB = DbgValue->getParent();
+ auto DL = DbgValue->getDebugLoc();
+ auto *LScope = LScopes.findLexicalScope(DL);
+ // Scope doesn't exist; this is a dead DBG_VALUE.
+ if (!LScope)
+ return false;
+ auto &LSRange = LScope->getRanges();
+ if (LSRange.size() == 0)
+ return false;
+
+ // Determine if the DBG_VALUE is valid at the beginning of its lexical block.
+ const MachineInstr *LScopeBegin = LSRange.front().first;
+ // Early exit if the lexical scope begins outside of the current block.
+ if (LScopeBegin->getParent() != MBB)
+ return false;
+ MachineBasicBlock::const_reverse_iterator Pred(DbgValue);
+ for (++Pred; Pred != MBB->rend(); ++Pred) {
+ if (Pred->getFlag(MachineInstr::FrameSetup))
+ break;
+ auto PredDL = Pred->getDebugLoc();
+ if (!PredDL || Pred->isMetaInstruction())
+ continue;
+ // Check whether the instruction preceding the DBG_VALUE is in the same
+ // (sub)scope as the DBG_VALUE.
+ if (DL->getScope() == PredDL->getScope())
+ return false;
+ auto *PredScope = LScopes.findLexicalScope(PredDL);
+ if (!PredScope || LScope->dominates(PredScope))
+ return false;
}
- if (MI->getOperand(0).isImm())
- return DebugLocEntry::Value(Expr, MI->getOperand(0).getImm());
- if (MI->getOperand(0).isFPImm())
- return DebugLocEntry::Value(Expr, MI->getOperand(0).getFPImm());
- if (MI->getOperand(0).isCImm())
- return DebugLocEntry::Value(Expr, MI->getOperand(0).getCImm());
- llvm_unreachable("Unexpected 4-operand DBG_VALUE instruction!");
+ // If the range of the DBG_VALUE is open-ended, report success.
+ if (!RangeEnd)
+ return true;
+
+ // Fail if there are instructions belonging to our scope in another block.
+ const MachineInstr *LScopeEnd = LSRange.back().second;
+ if (LScopeEnd->getParent() != MBB)
+ return false;
+
+ // Single, constant DBG_VALUEs in the prologue are promoted to be live
+ // throughout the function. This is a hack, presumably for DWARF v2 and not
+ // necessarily correct. It would be much better to use a dbg.declare instead
+ // if we know the constant is live throughout the scope.
+ if (DbgValue->getOperand(0).isImm() && MBB->pred_empty())
+ return true;
+
+ return false;
}
/// Build the location list for all DBG_VALUEs in the function that
/// describe the same variable. The resulting DebugLocEntries will have
/// strict monotonically increasing begin addresses and will never
-/// overlap.
+/// overlap. If the resulting list has only one entry that is valid
+/// throughout variable's scope return true.
//
// See the definition of DbgValueHistoryMap::Entry for an explanation of the
// different kinds of history map entries. One thing to be aware of is that if
// [1-3) [(reg0, fragment 0, 32), (reg1, fragment 32, 32)]
// [3-4) [(reg1, fragment 32, 32), (123, fragment 64, 32)]
// [4-) [(@g, fragment 0, 96)]
-void DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
+bool DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
const DbgValueHistoryMap::Entries &Entries) {
using OpenRange =
std::pair<DbgValueHistoryMap::EntryIndex, DebugLocEntry::Value>;
SmallVector<OpenRange, 4> OpenRanges;
+ bool isSafeForSingleLocation = true;
+ const MachineInstr *StartDebugMI = nullptr;
+ const MachineInstr *EndMI = nullptr;
for (auto EB = Entries.begin(), EI = EB, EE = Entries.end(); EI != EE; ++EI) {
const MachineInstr *Instr = EI->getInstr();
"Forgot label before/after instruction starting a range!");
const MCSymbol *EndLabel;
- if (std::next(EI) == Entries.end())
+ if (std::next(EI) == Entries.end()) {
EndLabel = Asm->getFunctionEnd();
+ if (EI->isClobber())
+ EndMI = EI->getInstr();
+ }
else if (std::next(EI)->isClobber())
EndLabel = getLabelAfterInsn(std::next(EI)->getInstr());
else
LLVM_DEBUG(dbgs() << "DotDebugLoc: " << *Instr << "\n");
// If this history map entry has a debug value, add that to the list of
- // open ranges.
+ // open ranges and check if its location is valid for a single value
+ // location.
if (EI->isDbgValue()) {
// Do not add undef debug values, as they are redundant information in
// the location list entries. An undef debug results in an empty location
if (!Instr->isUndefDebugValue()) {
auto Value = getDebugLocValue(Instr);
OpenRanges.emplace_back(EI->getEndIndex(), Value);
+
+ // TODO: Add support for single value fragment locations.
+ if (Instr->getDebugExpression()->isFragment())
+ isSafeForSingleLocation = false;
+
+ if (!StartDebugMI)
+ StartDebugMI = Instr;
+ } else {
+ isSafeForSingleLocation = false;
}
}
if (PrevEntry != DebugLoc.rend() && PrevEntry->MergeRanges(*CurEntry))
DebugLoc.pop_back();
}
+
+ return DebugLoc.size() == 1 && isSafeForSingleLocation &&
+ validThroughout(LScopes, StartDebugMI, EndMI);
}
DbgEntity *DwarfDebug::createConcreteEntity(DwarfCompileUnit &TheCU,
return ConcreteEntities.back().get();
}
-/// Determine whether a *singular* DBG_VALUE is valid for the entirety of its
-/// enclosing lexical scope. The check ensures there are no other instructions
-/// in the same lexical scope preceding the DBG_VALUE and that its range is
-/// either open or otherwise rolls off the end of the scope.
-static bool validThroughout(LexicalScopes &LScopes,
- const MachineInstr *DbgValue,
- const MachineInstr *RangeEnd) {
- assert(DbgValue->getDebugLoc() && "DBG_VALUE without a debug location");
- auto MBB = DbgValue->getParent();
- auto DL = DbgValue->getDebugLoc();
- auto *LScope = LScopes.findLexicalScope(DL);
- // Scope doesn't exist; this is a dead DBG_VALUE.
- if (!LScope)
- return false;
- auto &LSRange = LScope->getRanges();
- if (LSRange.size() == 0)
- return false;
-
- // Determine if the DBG_VALUE is valid at the beginning of its lexical block.
- const MachineInstr *LScopeBegin = LSRange.front().first;
- // Early exit if the lexical scope begins outside of the current block.
- if (LScopeBegin->getParent() != MBB)
- return false;
- MachineBasicBlock::const_reverse_iterator Pred(DbgValue);
- for (++Pred; Pred != MBB->rend(); ++Pred) {
- if (Pred->getFlag(MachineInstr::FrameSetup))
- break;
- auto PredDL = Pred->getDebugLoc();
- if (!PredDL || Pred->isMetaInstruction())
- continue;
- // Check whether the instruction preceding the DBG_VALUE is in the same
- // (sub)scope as the DBG_VALUE.
- if (DL->getScope() == PredDL->getScope())
- return false;
- auto *PredScope = LScopes.findLexicalScope(PredDL);
- if (!PredScope || LScope->dominates(PredScope))
- return false;
- }
-
- // If the range of the DBG_VALUE is open-ended, report success.
- if (!RangeEnd)
- return true;
-
- // Fail if there are instructions belonging to our scope in another block.
- const MachineInstr *LScopeEnd = LSRange.back().second;
- if (LScopeEnd->getParent() != MBB)
- return false;
-
- // Single, constant DBG_VALUEs in the prologue are promoted to be live
- // throughout the function. This is a hack, presumably for DWARF v2 and not
- // necessarily correct. It would be much better to use a dbg.declare instead
- // if we know the constant is live throughout the scope.
- if (DbgValue->getOperand(0).isImm() && MBB->pred_empty())
- return true;
-
- return false;
-}
-
// Find variables for each lexical scope.
void DwarfDebug::collectEntityInfo(DwarfCompileUnit &TheCU,
const DISubprogram *SP,
// Check if there is a single DBG_VALUE, valid throughout the var's scope.
// If the history map contains a single debug value, there may be an
// additional entry which clobbers the debug value.
+ size_t HistSize = HistoryMapEntries.size();
bool SingleValueWithClobber =
- HistoryMapEntries.size() == 2 && HistoryMapEntries[1].isClobber();
- if (HistoryMapEntries.size() == 1 || SingleValueWithClobber) {
+ HistSize == 2 && HistoryMapEntries[1].isClobber();
+ if (HistSize == 1 || SingleValueWithClobber) {
const auto *End =
SingleValueWithClobber ? HistoryMapEntries[1].getInstr() : nullptr;
if (validThroughout(LScopes, MInsn, End)) {
// Build the location list for this variable.
SmallVector<DebugLocEntry, 8> Entries;
- buildLocationList(Entries, HistoryMapEntries);
+ bool isValidSingleLocation = buildLocationList(Entries, HistoryMapEntries);
+
+ // Check whether buildLocationList managed to merge all locations to one
+ // that is valid throughout the variable's scope. If so, produce single
+ // value location.
+ if (isValidSingleLocation) {
+ RegVar->initializeDbgValue(Entries[0].getValues()[0]);
+ continue;
+ }
// If the variable has a DIBasicType, extract it. Basic types cannot have
// unique identifiers, so don't bother resolving the type with the
StringOffsetsSection, /* UseRelativeOffsets = */ true);
}
-void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer, const
- DebugLocStream::Entry &Entry,
+void DwarfDebug::emitDebugLocEntry(ByteStreamer &Streamer,
+ const DebugLocStream::Entry &Entry,
const DwarfCompileUnit *CU) {
auto &&Comments = DebugLocs.getComments(Entry);
auto Comment = Comments.begin();
#include "AddressPool.h"
#include "DebugLocStream.h"
+#include "DebugLocEntry.h"
#include "DwarfFile.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"
///
/// Variables can be created from \c DBG_VALUE instructions. Those whose
/// location changes over time use \a DebugLocListIndex, while those with a
-/// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
+/// single location use \a ValueLoc and (optionally) a single entry of \a Expr.
///
/// Variables that have been optimized out use none of these fields.
class DbgVariable : public DbgEntity {
- unsigned DebugLocListIndex = ~0u; /// Offset in DebugLocs.
- const MachineInstr *MInsn = nullptr; /// DBG_VALUE instruction.
+ /// Offset in DebugLocs.
+ unsigned DebugLocListIndex = ~0u;
+ /// Single value location description.
+ std::unique_ptr<DebugLocEntry::Value> ValueLoc = nullptr;
struct FrameIndexExpr {
int FI;
/// Initialize from the MMI table.
void initializeMMI(const DIExpression *E, int FI) {
assert(FrameIndexExprs.empty() && "Already initialized?");
- assert(!MInsn && "Already initialized?");
+ assert(!ValueLoc.get() && "Already initialized?");
assert((!E || E->isValid()) && "Expected valid expression");
assert(FI != std::numeric_limits<int>::max() && "Expected valid index");
FrameIndexExprs.push_back({FI, E});
}
- /// Initialize from a DBG_VALUE instruction.
- void initializeDbgValue(const MachineInstr *DbgValue) {
+ // Initialize variable's location.
+ void initializeDbgValue(DebugLocEntry::Value Value) {
assert(FrameIndexExprs.empty() && "Already initialized?");
- assert(!MInsn && "Already initialized?");
-
- assert(getVariable() == DbgValue->getDebugVariable() && "Wrong variable");
- assert(getInlinedAt() == DbgValue->getDebugLoc()->getInlinedAt() &&
- "Wrong inlined-at");
+ assert(!ValueLoc && "Already initialized?");
+ assert(!Value.getExpression()->isFragment() && "Fragments not supported.");
- MInsn = DbgValue;
- if (auto *E = DbgValue->getDebugExpression())
+ ValueLoc = llvm::make_unique<DebugLocEntry::Value>(Value);
+ if (auto *E = ValueLoc->getExpression())
if (E->getNumElements())
FrameIndexExprs.push_back({0, E});
}
+ /// Initialize from a DBG_VALUE instruction.
+ void initializeDbgValue(const MachineInstr *DbgValue);
+
// Accessors.
const DILocalVariable *getVariable() const {
return cast<DILocalVariable>(getEntity());
}
const DIExpression *getSingleExpression() const {
- assert(MInsn && FrameIndexExprs.size() <= 1);
+ assert(ValueLoc.get() && FrameIndexExprs.size() <= 1);
return FrameIndexExprs.size() ? FrameIndexExprs[0].Expr : nullptr;
}
void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
StringRef getName() const { return getVariable()->getName(); }
- const MachineInstr *getMInsn() const { return MInsn; }
+ const DebugLocEntry::Value *getValueLoc() const { return ValueLoc.get(); }
/// Get the FI entries, sorted by fragment offset.
ArrayRef<FrameIndexExpr> getFrameIndexExprs() const;
bool hasFrameIndexExprs() const { return !FrameIndexExprs.empty(); }
}
bool hasComplexAddress() const {
- assert(MInsn && "Expected DBG_VALUE, not MMI variable");
+ assert(ValueLoc.get() && "Expected DBG_VALUE, not MMI variable");
assert((FrameIndexExprs.empty() ||
(FrameIndexExprs.size() == 1 &&
FrameIndexExprs[0].Expr->getNumElements())) &&
DenseSet<InlinedEntity> &ProcessedVars);
/// Build the location list for all DBG_VALUEs in the
- /// function that describe the same variable.
- void buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
+ /// function that describe the same variable. If the resulting
+ /// list has only one entry that is valid for entire variable's
+ /// scope return true.
+ bool buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
const DbgValueHistoryMap::Entries &Entries);
/// Collect variable information from the side table maintained by MF.
addConstantValue(Die, isUnsignedDIType(DD, Ty), MO.getImm());
}
+void DwarfUnit::addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty) {
+ addConstantValue(Die, isUnsignedDIType(DD, Ty), Val);
+}
+
void DwarfUnit::addConstantValue(DIE &Die, bool Unsigned, uint64_t Val) {
// FIXME: This is a bit conservative/simple - it emits negative values always
// sign extended to 64 bits rather than minimizing the number of bytes.
void addConstantValue(DIE &Die, const ConstantInt *CI, const DIType *Ty);
void addConstantValue(DIE &Die, const APInt &Val, const DIType *Ty);
void addConstantValue(DIE &Die, const APInt &Val, bool Unsigned);
+ void addConstantValue(DIE &Die, uint64_t Val, const DIType *Ty);
void addConstantValue(DIE &Die, bool Unsigned, uint64_t Val);
/// Add constant value entry in variable DIE.
--- /dev/null
+# RUN: llc -start-before=livedebugvalues %s -filetype=asm -o -| FileCheck %s
+#
+# DbgEntityHistoryCalculator should close variable's range at the end of
+# the basic block when variable is referenced through non-changing frame
+# pointer register. Having BB1 that branches to BB2 and BB3, where
+# BB2 falls through to BB3, variable can have different locations at BB1 and BB2.
+# Since input locations at BB3 for same variable are different LiveDebugValues
+# wont generate DBG_VALUE for BB3. If last variable location at BB2 is
+# non-changing register, DbgEntityHistoryCalculator will extend range of
+# DBG_VALUE from BB2 to whole BB3 and thus produce incorrect range for
+# case when we took branch BB3 from BB1.
+#
+# Verifies that "local1" stack location is ended at the end of the block (.Ltmp6).
+#
+# CHECK: .Ltmp4:
+# CHECK-NEXT: #DEBUG_VALUE: foo:local1 <- [DW_OP_constu 4, DW_OP_minus, DW_OP_deref] $rbp
+# CHECK: jmp .LBB0_2
+# CHECK-NEXT: .Ltmp6:
+# CHECK: .Lfunc_end0:
+#
+# CHECK: .Linfo_string7:
+# CHECK-NEXT: .asciz "local1"
+#
+# CHECK: .Ldebug_loc2:
+# CHECK-NEXT: .quad .Ltmp1-.Lfunc_begin0
+# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
+# CHECK-NEXT: .short 1 # Loc expr size
+# CHECK-NEXT: .byte 94 # super-register DW_OP_reg14
+# CHECK-NEXT: .quad .Ltmp4-.Lfunc_begin0
+# CHECK-NEXT: .quad .Ltmp6-.Lfunc_begin0
+# CHECK-NEXT: .short 2 # Loc expr size
+# CHECK-NEXT: .byte 118 # DW_OP_breg6
+# CHECK-NEXT: .byte 124 # -4
+#
+# CHECK: .long .Ldebug_loc2 # DW_AT_location
+# CHECK-NEXT: .long .Linfo_string7 # DW_AT_name
+
+
+--- |
+ ; ModuleID = 'dbg-stack-value-range.ll'
+ source_filename = "dbg-stack-value-range.c"
+ target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+ target triple = "x86_64-unknown-linux-gnu"
+
+ ; Function Attrs: nounwind uwtable
+ define dso_local i32 @foo(i32 %X) local_unnamed_addr #0 !dbg !7 {
+ entry:
+ %local1 = alloca i32, align 4
+ call void @llvm.dbg.value(metadata i32 %X, metadata !12, metadata !DIExpression()), !dbg !15
+ %0 = bitcast i32* %local1 to i8*, !dbg !15
+ call void @llvm.lifetime.start.p0i8(i64 4, i8* nonnull %0), !dbg !15
+ call void @llvm.dbg.value(metadata i32 5, metadata !14, metadata !DIExpression()), !dbg !15
+ %call = tail call i32 (...) @check(), !dbg !15
+ %tobool = icmp eq i32 %call, 0, !dbg !15
+ br i1 %tobool, label %if.else, label %if.then, !dbg !15
+
+ if.then: ; preds = %entry
+ call void @llvm.dbg.value(metadata i32 4, metadata !13, metadata !DIExpression()), !dbg !15
+ store i32 4, i32* %local1, align 4, !dbg !15, !tbaa !16
+ call void @llvm.dbg.value(metadata i32* %local1, metadata !13, metadata !DIExpression(DW_OP_deref)), !dbg !15
+ %call1 = call i32 @init(i32* nonnull %local1), !dbg !15
+ call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
+ br label %if.end, !dbg !15
+
+ if.else: ; preds = %entry
+ call void @llvm.dbg.value(metadata i32 5, metadata !13, metadata !DIExpression()), !dbg !15
+ store i32 5, i32* %local1, align 4, !dbg !15, !tbaa !16
+ br label %if.end
+
+ if.end: ; preds = %if.else, %if.then
+ %1 = bitcast i32* %local1 to i8*, !dbg !15
+ call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
+ %call2 = call i32 (...) @init2(), !dbg !15
+ call void @llvm.dbg.value(metadata i32 undef, metadata !14, metadata !DIExpression()), !dbg !15
+ %2 = load i32, i32* %local1, align 4, !dbg !15, !tbaa !16
+ call void @llvm.dbg.value(metadata i32 %2, metadata !13, metadata !DIExpression()), !dbg !15
+ call void @llvm.lifetime.end.p0i8(i64 4, i8* nonnull %1), !dbg !15
+ ret i32 %2, !dbg !15
+ }
+
+ ; Function Attrs: argmemonly nounwind
+ declare void @llvm.lifetime.start.p0i8(i64 immarg, i8* nocapture)
+
+ declare dso_local i32 @check(...) local_unnamed_addr
+
+ declare dso_local i32 @init(i32*) local_unnamed_addr
+
+ declare dso_local i32 @init2(...) local_unnamed_addr
+
+ ; Function Attrs: argmemonly nounwind
+ declare void @llvm.lifetime.end.p0i8(i64 immarg, i8* nocapture)
+
+ ; Function Attrs: nounwind readnone speculatable
+ declare void @llvm.dbg.value(metadata, metadata, metadata)
+
+ ; Function Attrs: nounwind
+ declare void @llvm.stackprotector(i8*, i8**)
+
+ attributes #0 = { nounwind uwtable "no-frame-pointer-elim"="false" "no-frame-pointer-elim-non-leaf" }
+
+ !llvm.dbg.cu = !{!0}
+ !llvm.module.flags = !{!3, !4, !5}
+ !llvm.ident = !{!6}
+
+ !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 9.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
+ !1 = !DIFile(filename: "dbg-stack-value-range.c", directory: "/")
+ !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 9.0.0"}
+ !7 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 11, type: !8, scopeLine: 11, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
+ !8 = !DISubroutineType(types: !9)
+ !9 = !{!10, !10}
+ !10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
+ !11 = !{!12, !13, !14}
+ !12 = !DILocalVariable(name: "X", arg: 1, scope: !7, file: !1, line: 11, type: !10)
+ !13 = !DILocalVariable(name: "local1", scope: !7, file: !1, line: 12, type: !10)
+ !14 = !DILocalVariable(name: "local2", scope: !7, file: !1, line: 12, type: !10)
+ !15 = !DILocation(line: 11, column: 13, scope: !7)
+ !16 = !{!17, !17, i64 0}
+ !17 = !{!"int", !18, i64 0}
+ !18 = !{!"omnipotent char", !19, i64 0}
+ !19 = !{!"Simple C/C++ TBAA"}
+
+...
+---
+name: foo
+alignment: 4
+frameInfo:
+ stackSize: 24
+ offsetAdjustment: -24
+ maxAlignment: 4
+ adjustsStack: true
+ hasCalls: true
+fixedStack:
+ - { id: 0, type: spill-slot, offset: -16, size: 8, alignment: 16, stack-id: 0,
+ callee-saved-register: '$r14d', callee-saved-restored: true, debug-info-variable: '',
+ debug-info-expression: '', debug-info-location: '' }
+stack:
+ - { id: 0, name: local1, type: default, offset: -20, size: 4, alignment: 4,
+ stack-id: 0, callee-saved-register: '', callee-saved-restored: true,
+ debug-info-variable: '', debug-info-expression: '', debug-info-location: '' }
+body: |
+ bb.0.entry:
+ successors: %bb.3(0x30000000), %bb.1(0x50000000)
+
+ DBG_VALUE $edi, $noreg, !12, !DIExpression(), debug-location !15
+ frame-setup PUSH64r killed $rbp, implicit-def $rsp, implicit $rsp
+ CFI_INSTRUCTION def_cfa_offset 16
+ CFI_INSTRUCTION offset $rbp, -16
+ $rbp = frame-setup MOV64rr $rsp
+ CFI_INSTRUCTION def_cfa_register $rbp
+ $rsp = frame-setup SUB64ri8 $rsp, 16, implicit-def dead $eflags
+ DBG_VALUE 5, $noreg, !14, !DIExpression(), debug-location !15
+ $r14d = MOV32ri 4, implicit-def $r14
+ DBG_VALUE $r14d, $noreg, !13, !DIExpression(), debug-location !15
+ dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
+ CALL64pcrel32 @check, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def $eax, debug-location !15
+ TEST32rr killed renamable $eax, renamable $eax, implicit-def $eflags, debug-location !15
+ JCC_1 %bb.3, 4, implicit killed $eflags, debug-location !15
+
+ bb.1.if.then:
+ successors: %bb.3(0x80000000)
+
+ MOV32mr $rbp, 1, $noreg, -4, $noreg, $r14d, debug-location !15 :: (store 4 into %ir.local1, !tbaa !16)
+ DBG_VALUE $rbp, $noreg, !13, !DIExpression(DW_OP_constu, 4, DW_OP_minus, DW_OP_deref), debug-location !15
+ renamable $rdi = LEA64r $rbp, 1, $noreg, -4, $noreg
+ CALL64pcrel32 @init, csr_64, implicit $rsp, implicit $ssp, implicit $rdi, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
+ DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
+ JMP_1 %bb.3
+
+ bb.3.if.end:
+ DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
+ dead $eax = XOR32rr undef $eax, undef $eax, implicit-def dead $eflags, implicit-def $al, debug-location !15
+ CALL64pcrel32 @init2, csr_64, implicit $rsp, implicit $ssp, implicit $al, implicit-def $rsp, implicit-def $ssp, implicit-def dead $eax, debug-location !15
+ DBG_VALUE $noreg, $noreg, !14, !DIExpression(), debug-location !15
+ renamable $eax = MOV32rm $rbp, 1, $noreg, -4, $noreg, debug-location !15 :: (dereferenceable load 4 from %ir.local1, !tbaa !16)
+ $rsp = frame-destroy ADD64ri8 $rsp, 16, implicit-def dead $eflags, debug-location !15
+ $rbp = frame-destroy POP64r implicit-def $rsp, implicit $rsp, debug-location !15
+ CFI_INSTRUCTION def_cfa $rsp, 8, debug-location !15
+ RETQ $eax, debug-location !15
+
+...
for.inc13: ; preds = %for.inc10
%inc14 = add i32 %d.06, 1, !dbg !37
- tail call void @llvm.dbg.value(metadata i32 %inc14, metadata !16, metadata !DIExpression()), !dbg !37
+ tail call void @llvm.dbg.value(metadata i32 %inc14, metadata !16, metadata !DIExpression()), !dbg !42
%exitcond12 = icmp eq i32 %inc14, 30, !dbg !37
br i1 %exitcond12, label %for.inc16, label %for.cond4.preheader, !dbg !37
projects / llvm / commitdiff