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[DebugInfo] Generate DWARF debug information for labels. 

There are two forms for label debug information in DWARF format.

1. Labels in a non-inlined function:

DW_TAG_label
  DW_AT_name
  DW_AT_decl_file
  DW_AT_decl_line
  DW_AT_low_pc

2. Labels in an inlined function:

DW_TAG_label
  DW_AT_abstract_origin
  DW_AT_low_pc

We will collect label information from DBG_LABEL. Before every DBG_LABEL,
we will generate a temporary symbol to denote the location of the label.
The symbol could be used to get DW_AT_low_pc afterwards. So, we create a
mapping between 'inlined label' and DBG_LABEL MachineInstr in DebugHandlerBase.
The DBG_LABEL in the mapping is used to query the symbol before it.

The AbstractLabels in DwarfCompileUnit is used to process labels in inlined
functions.

We also keep a mapping between scope and labels in DwarfFile to help to
generate correct tree structure of DIEs.

It also generates label debug information under global isel.

Differential Revision: https://reviews.llvm.org/D45556

llvm-svn: 338390
This commit is contained in:
Hsiangkai Wang 2018-07-31 14:48:32 +00:00
parent ab79414f7b
commit cbc58ada99
19 changed files with 534 additions and 147 deletions
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4
llvm/include/llvm/CodeGen/GlobalISel/MachineIRBuilder.h
View File

@ -208,6 +208,10 @@ public:
const MDNode *Variable,
const MDNode *Expr);
/// Build and insert a DBG_LABEL instructions specifying that \p Label is
/// given. Convert "llvm.dbg.label Label" to "DBG_LABEL Label".
MachineInstrBuilder buildDbgLabel(const MDNode *Label);
/// Build and insert \p Res = G_FRAME_INDEX \p Idx
///
/// G_FRAME_INDEX materializes the address of an alloca value or other

2
llvm/lib/CodeGen/AsmPrinter/CMakeLists.txt
View File

@ -5,7 +5,7 @@ add_llvm_library(LLVMAsmPrinter
AsmPrinter.cpp
AsmPrinterDwarf.cpp
AsmPrinterInlineAsm.cpp
DbgValueHistoryCalculator.cpp
DbgEntityHistoryCalculator.cpp
DebugHandlerBase.cpp
DebugLocStream.cpp
DIE.cpp

2
llvm/lib/CodeGen/AsmPrinter/CodeViewDebug.h
View File

@ -14,7 +14,7 @@
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_CODEVIEWDEBUG_H
#include "DbgValueHistoryCalculator.h"
#include "DbgEntityHistoryCalculator.h"
#include "DebugHandlerBase.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/DenseMap.h"

67
llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp → llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp
View File

@ -1,4 +1,4 @@
//===- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp --------------===//
//===- llvm/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.cpp -------------===//
//
// The LLVM Compiler Infrastructure
//
@ -7,7 +7,7 @@
//
//===----------------------------------------------------------------------===//
#include "DbgValueHistoryCalculator.h"
#include "DbgEntityHistoryCalculator.h"
#include "llvm/ADT/BitVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallVector.h"
@ -78,11 +78,17 @@ unsigned DbgValueHistoryMap::getRegisterForVar(InlinedVariable Var) const {
return isDescribedByReg(*Ranges.back().first);
}
void DbgLabelInstrMap::addInstr(InlinedLabel Label, const MachineInstr &MI) {
assert(MI.isDebugLabel() && "not a DBG_LABEL");
LabelInstr[Label] = &MI;
}
namespace {
// Maps physreg numbers to the variables they describe.
using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
using RegDescribedVarsMap = std::map<unsigned, SmallVector<InlinedVariable, 1>>;
using InlinedLabel = DbgLabelInstrMap::InlinedLabel;
} // end anonymous namespace
@ -187,9 +193,10 @@ static void collectChangingRegs(const MachineFunction *MF,
}
}
void llvm::calculateDbgValueHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &Result) {
void llvm::calculateDbgEntityHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &DbgValues,
DbgLabelInstrMap &DbgLabels) {
BitVector ChangingRegs(TRI->getNumRegs());
collectChangingRegs(MF, TRI, ChangingRegs);
@ -210,14 +217,14 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
// If this is a virtual register, only clobber it since it doesn't
// have aliases.
if (TRI->isVirtualRegister(MO.getReg()))
clobberRegisterUses(RegVars, MO.getReg(), Result, MI);
clobberRegisterUses(RegVars, MO.getReg(), DbgValues, MI);
// If this is a register def operand, it may end a debug value
// range.
else {
for (MCRegAliasIterator AI(MO.getReg(), TRI, true); AI.isValid();
++AI)
if (ChangingRegs.test(*AI))
clobberRegisterUses(RegVars, *AI, Result, MI);
clobberRegisterUses(RegVars, *AI, DbgValues, MI);
}
} else if (MO.isRegMask()) {
// If this is a register mask operand, clobber all debug values in
@ -226,7 +233,7 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
// Don't consider SP to be clobbered by register masks.
if (unsigned(I) != SP && TRI->isPhysicalRegister(I) &&
MO.clobbersPhysReg(I)) {
clobberRegisterUses(RegVars, I, Result, MI);
clobberRegisterUses(RegVars, I, DbgValues, MI);
}
}
}
@ -234,26 +241,34 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
continue;
}
// Skip DBG_LABEL instructions.
if (MI.isDebugLabel())
continue;
if (MI.isDebugValue()) {
assert(MI.getNumOperands() > 1 && "Invalid DBG_VALUE instruction!");
// Use the base variable (without any DW_OP_piece expressions)
// as index into History. The full variables including the
// piece expressions are attached to the MI.
const DILocalVariable *RawVar = MI.getDebugVariable();
assert(RawVar->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
"Expected inlined-at fields to agree");
InlinedVariable Var(RawVar, MI.getDebugLoc()->getInlinedAt());
assert(MI.getNumOperands() > 1 && "Invalid DBG_VALUE instruction!");
// Use the base variable (without any DW_OP_piece expressions)
// as index into History. The full variables including the
// piece expressions are attached to the MI.
const DILocalVariable *RawVar = MI.getDebugVariable();
assert(RawVar->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
"Expected inlined-at fields to agree");
InlinedVariable Var(RawVar, MI.getDebugLoc()->getInlinedAt());
if (unsigned PrevReg = DbgValues.getRegisterForVar(Var))
dropRegDescribedVar(RegVars, PrevReg, Var);
if (unsigned PrevReg = Result.getRegisterForVar(Var))
dropRegDescribedVar(RegVars, PrevReg, Var);
DbgValues.startInstrRange(Var, MI);
Result.startInstrRange(Var, MI);
if (unsigned NewReg = isDescribedByReg(MI))
addRegDescribedVar(RegVars, NewReg, Var);
if (unsigned NewReg = isDescribedByReg(MI))
addRegDescribedVar(RegVars, NewReg, Var);
} else if (MI.isDebugLabel()) {
assert(MI.getNumOperands() == 1 && "Invalid DBG_LABEL instruction!");
const DILabel *RawLabel = MI.getDebugLabel();
assert(RawLabel->isValidLocationForIntrinsic(MI.getDebugLoc()) &&
"Expected inlined-at fields to agree");
// When collecting debug information for labels, there is no MCSymbol
// generated for it. So, we keep MachineInstr in DbgLabels in order
// to query MCSymbol afterward.
InlinedLabel L(RawLabel, MI.getDebugLoc()->getInlinedAt());
DbgLabels.addInstr(L, MI);
}
}
// Make sure locations for register-described variables are valid only
@ -264,7 +279,7 @@ void llvm::calculateDbgValueHistory(const MachineFunction *MF,
auto CurElem = I++; // CurElem can be erased below.
if (TRI->isVirtualRegister(CurElem->first) ||
ChangingRegs.test(CurElem->first))
clobberRegisterUses(RegVars, CurElem, Result, MBB.back());
clobberRegisterUses(RegVars, CurElem, DbgValues, MBB.back());
}
}
}

29
llvm/lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h → llvm/lib/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.h
View File

@ -1,4 +1,4 @@
//===- llvm/CodeGen/AsmPrinter/DbgValueHistoryCalculator.h ------*- C++ -*-===//
//===- llvm/CodeGen/AsmPrinter/DbgEntityHistoryCalculator.h -----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
@ -58,9 +58,30 @@ public:
#endif
};
void calculateDbgValueHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &Result);
/// For each inlined instance of a source-level label, keep the corresponding
/// DBG_LABEL instruction. The DBG_LABEL instruction could be used to generate
/// a temporary (assembler) label before it.
class DbgLabelInstrMap {
public:
using InlinedLabel = std::pair<const DILabel *, const DILocation *>;
using InstrMap = MapVector<InlinedLabel, const MachineInstr *>;
private:
InstrMap LabelInstr;
public:
void addInstr(InlinedLabel Label, const MachineInstr &MI);
bool empty() const { return LabelInstr.empty(); }
void clear() { LabelInstr.clear(); }
InstrMap::const_iterator begin() const { return LabelInstr.begin(); }
InstrMap::const_iterator end() const { return LabelInstr.end(); }
};
void calculateDbgEntityHistory(const MachineFunction *MF,
const TargetRegisterInfo *TRI,
DbgValueHistoryMap &DbgValues,
DbgLabelInstrMap &DbgLabels);
} // end namespace llvm

12
llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.cpp
View File

@ -190,8 +190,9 @@ void DebugHandlerBase::beginFunction(const MachineFunction *MF) {
// Calculate history for local variables.
assert(DbgValues.empty() && "DbgValues map wasn't cleaned!");
calculateDbgValueHistory(MF, Asm->MF->getSubtarget().getRegisterInfo(),
DbgValues);
assert(DbgLabels.empty() && "DbgLabels map wasn't cleaned!");
calculateDbgEntityHistory(MF, Asm->MF->getSubtarget().getRegisterInfo(),
DbgValues, DbgLabels);
LLVM_DEBUG(DbgValues.dump());
// Request labels for the full history.
@ -229,6 +230,12 @@ void DebugHandlerBase::beginFunction(const MachineFunction *MF) {
}
}
// Ensure there is a symbol before DBG_LABEL.
for (const auto &I : DbgLabels) {
const MachineInstr *MI = I.second;
requestLabelBeforeInsn(MI);
}
PrevInstLoc = DebugLoc();
PrevLabel = Asm->getFunctionBegin();
beginFunctionImpl(MF);
@ -296,6 +303,7 @@ void DebugHandlerBase::endFunction(const MachineFunction *MF) {
if (hasDebugInfo(MMI, MF))
endFunctionImpl(MF);
DbgValues.clear();
DbgLabels.clear();
LabelsBeforeInsn.clear();
LabelsAfterInsn.clear();
}

5
llvm/lib/CodeGen/AsmPrinter/DebugHandlerBase.h
View File

@ -16,7 +16,7 @@
#define LLVM_LIB_CODEGEN_ASMPRINTER_DEBUGHANDLERBASE_H
#include "AsmPrinterHandler.h"
#include "DbgValueHistoryCalculator.h"
#include "DbgEntityHistoryCalculator.h"
#include "llvm/ADT/Optional.h"
#include "llvm/CodeGen/LexicalScopes.h"
#include "llvm/CodeGen/MachineInstr.h"
@ -82,6 +82,9 @@ protected:
/// variable. Variables are listed in order of appearance.
DbgValueHistoryMap DbgValues;
/// Mapping of inlined labels and DBG_LABEL machine instruction.
DbgLabelInstrMap DbgLabels;
/// Maps instruction with label emitted before instruction.
/// FIXME: Make this private from DwarfDebug, we have the necessary accessors
/// for it.

90
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -506,6 +506,18 @@ DIE *DwarfCompileUnit::constructVariableDIE(DbgVariable &DV, bool Abstract) {
return D;
}
DIE *DwarfCompileUnit::constructLabelDIE(DbgLabel &DL,
const LexicalScope &Scope) {
auto LabelDie = DIE::get(DIEValueAllocator, DL.getTag());
insertDIE(DL.getLabel(), LabelDie);
DL.setDIE(*LabelDie);
if (Scope.isAbstractScope())
applyLabelAttributes(DL, *LabelDie);
return LabelDie;
}
DIE *DwarfCompileUnit::constructVariableDIEImpl(const DbgVariable &DV,
bool Abstract) {
// Define variable debug information entry.
@ -699,6 +711,9 @@ DIE *DwarfCompileUnit::createScopeChildrenDIE(LexicalScope *Scope,
if (HasNonScopeChildren)
*HasNonScopeChildren = !Children.empty();
for (DbgLabel *DL : DU->getScopeLabels().lookup(Scope))
Children.push_back(constructLabelDIE(*DL, *Scope));
for (LexicalScope *LS : Scope->getChildren())
constructScopeDIE(LS, Children);
@ -824,40 +839,52 @@ void DwarfCompileUnit::finishSubprogramDefinition(const DISubprogram *SP) {
}
}
void DwarfCompileUnit::finishVariableDefinition(const DbgVariable &Var) {
DbgVariable *AbsVar = getExistingAbstractVariable(
InlinedVariable(Var.getVariable(), Var.getInlinedAt()));
auto *VariableDie = Var.getDIE();
if (AbsVar && AbsVar->getDIE()) {
addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
*AbsVar->getDIE());
} else
applyVariableAttributes(Var, *VariableDie);
void DwarfCompileUnit::finishEntityDefinition(const DbgEntity *Entity) {
DbgEntity *AbsEntity = getExistingAbstractEntity(Entity->getEntity());
auto *Die = Entity->getDIE();
/// Label may be used to generate DW_AT_low_pc, so put it outside
/// if/else block.
const DbgLabel *Label = nullptr;
if (AbsEntity && AbsEntity->getDIE()) {
addDIEEntry(*Die, dwarf::DW_AT_abstract_origin, *AbsEntity->getDIE());
Label = dyn_cast<const DbgLabel>(Entity);
} else {
if (const DbgVariable *Var = dyn_cast<const DbgVariable>(Entity))
applyVariableAttributes(*Var, *Die);
else if ((Label = dyn_cast<const DbgLabel>(Entity)))
applyLabelAttributes(*Label, *Die);
else
llvm_unreachable("DbgEntity must be DbgVariable or DbgLabel.");
}
if (Label) {
const MCSymbol *Sym = Label->getSymbol();
addLabelAddress(*Die, dwarf::DW_AT_low_pc, Sym);
}
}
DbgVariable *DwarfCompileUnit::getExistingAbstractVariable(InlinedVariable IV) {
const DILocalVariable *Cleansed;
return getExistingAbstractVariable(IV, Cleansed);
}
// Find abstract variable, if any, associated with Var.
DbgVariable *DwarfCompileUnit::getExistingAbstractVariable(
InlinedVariable IV, const DILocalVariable *&Cleansed) {
// More then one inlined variable corresponds to one abstract variable.
Cleansed = IV.first;
auto &AbstractVariables = getAbstractVariables();
auto I = AbstractVariables.find(Cleansed);
if (I != AbstractVariables.end())
DbgEntity *DwarfCompileUnit::getExistingAbstractEntity(const DINode *Node) {
auto &AbstractEntities = getAbstractEntities();
auto I = AbstractEntities.find(Node);
if (I != AbstractEntities.end())
return I->second.get();
return nullptr;
}
void DwarfCompileUnit::createAbstractVariable(const DILocalVariable *Var,
LexicalScope *Scope) {
void DwarfCompileUnit::createAbstractEntity(const DINode *Node,
LexicalScope *Scope) {
assert(Scope && Scope->isAbstractScope());
auto AbsDbgVariable = llvm::make_unique<DbgVariable>(Var, /* IA */ nullptr);
DU->addScopeVariable(Scope, AbsDbgVariable.get());
getAbstractVariables()[Var] = std::move(AbsDbgVariable);
auto &Entity = getAbstractEntities()[Node];
if (isa<const DILocalVariable>(Node)) {
Entity = llvm::make_unique<DbgVariable>(
cast<const DILocalVariable>(Node), nullptr /* IA */);;
DU->addScopeVariable(Scope, cast<DbgVariable>(Entity.get()));
} else if (isa<const DILabel>(Node)) {
Entity = llvm::make_unique<DbgLabel>(
cast<const DILabel>(Node), nullptr /* IA */);
DU->addScopeLabel(Scope, cast<DbgLabel>(Entity.get()));
}
}
void DwarfCompileUnit::emitHeader(bool UseOffsets) {
@ -1012,6 +1039,15 @@ void DwarfCompileUnit::applyVariableAttributes(const DbgVariable &Var,
addFlag(VariableDie, dwarf::DW_AT_artificial);
}
void DwarfCompileUnit::applyLabelAttributes(const DbgLabel &Label,
DIE &LabelDie) {
StringRef Name = Label.getName();
if (!Name.empty())
addString(LabelDie, dwarf::DW_AT_name, Name);
const auto *DILabel = Label.getLabel();
addSourceLine(LabelDie, DILabel);
}
/// Add a Dwarf expression attribute data and value.
void DwarfCompileUnit::addExpr(DIELoc &Die, dwarf::Form Form,
const MCExpr *Expr) {

23
llvm/lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
View File

@ -14,7 +14,7 @@
#ifndef LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFCOMPILEUNIT_H
#include "DbgValueHistoryCalculator.h"
#include "DbgEntityHistoryCalculator.h"
#include "DwarfDebug.h"
#include "DwarfUnit.h"
#include "llvm/ADT/ArrayRef.h"
@ -81,7 +81,7 @@ class DwarfCompileUnit final : public DwarfUnit {
const MCSymbol *BaseAddress = nullptr;
DenseMap<const MDNode *, DIE *> AbstractSPDies;
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
DenseMap<const DINode *, std::unique_ptr<DbgEntity>> AbstractEntities;
/// DWO ID for correlating skeleton and split units.
uint64_t DWOId = 0;
@ -98,10 +98,10 @@ class DwarfCompileUnit final : public DwarfUnit {
return DU->getAbstractSPDies();
}
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> &getAbstractVariables() {
DenseMap<const DINode *, std::unique_ptr<DbgEntity>> &getAbstractEntities() {
if (isDwoUnit() && !DD->shareAcrossDWOCUs())
return AbstractVariables;
return DU->getAbstractVariables();
return AbstractEntities;
return DU->getAbstractEntities();
}
public:
@ -194,6 +194,9 @@ public:
DIE *constructVariableDIE(DbgVariable &DV, const LexicalScope &Scope,
DIE *&ObjectPointer);
/// Construct a DIE for the given DbgLabel.
DIE *constructLabelDIE(DbgLabel &DL, const LexicalScope &Scope);
/// A helper function to create children of a Scope DIE.
DIE *createScopeChildrenDIE(LexicalScope *Scope,
SmallVectorImpl<DIE *> &Children,
@ -210,14 +213,12 @@ public:
DIE *constructImportedEntityDIE(const DIImportedEntity *Module);
void finishSubprogramDefinition(const DISubprogram *SP);
void finishVariableDefinition(const DbgVariable &Var);
void finishEntityDefinition(const DbgEntity *Entity);
/// Find abstract variable associated with Var.
using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
const DILocalVariable *&Cleansed);
DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
void createAbstractVariable(const DILocalVariable *Var, LexicalScope *Scope);
DbgEntity *getExistingAbstractEntity(const DINode *Node);
void createAbstractEntity(const DINode *Node, LexicalScope *Scope);
/// Set the skeleton unit associated with this unit.
void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }
@ -288,6 +289,8 @@ public:
void applySubprogramAttributesToDefinition(const DISubprogram *SP,
DIE &SPDie);
void applyLabelAttributes(const DbgLabel &Label, DIE &LabelDie);
/// getRangeLists - Get the vector of range lists.
const SmallVectorImpl<RangeSpanList> &getRangeLists() const {
return (Skeleton ? Skeleton : this)->CURangeLists;

135
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -188,12 +188,12 @@ bool DebugLocDwarfExpression::isFrameRegister(const TargetRegisterInfo &TRI,
}
bool DbgVariable::isBlockByrefVariable() const {
assert(Var && "Invalid complex DbgVariable!");
return Var->getType().resolve()->isBlockByrefStruct();
assert(getVariable() && "Invalid complex DbgVariable!");
return getVariable()->getType().resolve()->isBlockByrefStruct();
}
const DIType *DbgVariable::getType() const {
DIType *Ty = Var->getType().resolve();
DIType *Ty = getVariable()->getType().resolve();
// FIXME: isBlockByrefVariable should be reformulated in terms of complex
// addresses instead.
if (Ty->isBlockByrefStruct()) {
@ -258,8 +258,8 @@ ArrayRef<DbgVariable::FrameIndexExpr> DbgVariable::getFrameIndexExprs() const {
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(V.Var == Var && "conflicting variable");
assert(V.IA == IA && "conflicting inlined-at location");
assert(V.getVariable() == getVariable() && "conflicting variable");
assert(V.getInlinedAt() == getInlinedAt() && "conflicting inlined-at location");
assert(!FrameIndexExprs.empty() && "Expected an MMI entry");
assert(!V.FrameIndexExprs.empty() && "Expected an MMI entry");
@ -726,16 +726,16 @@ void DwarfDebug::beginModule() {
}
}
void DwarfDebug::finishVariableDefinitions() {
for (const auto &Var : ConcreteVariables) {
DIE *VariableDie = Var->getDIE();
assert(VariableDie);
void DwarfDebug::finishEntityDefinitions() {
for (const auto &Entity : ConcreteEntities) {
DIE *Die = Entity->getDIE();
assert(Die);
// FIXME: Consider the time-space tradeoff of just storing the unit pointer
// in the ConcreteVariables list, rather than looking it up again here.
// in the ConcreteEntities list, rather than looking it up again here.
// DIE::getUnit isn't simple - it walks parent pointers, etc.
DwarfCompileUnit *Unit = CUDieMap.lookup(VariableDie->getUnitDie());
DwarfCompileUnit *Unit = CUDieMap.lookup(Die->getUnitDie());
assert(Unit);
Unit->finishVariableDefinition(*Var);
Unit->finishEntityDefinition(Entity.get());
}
}
@ -753,7 +753,7 @@ void DwarfDebug::finalizeModuleInfo() {
finishSubprogramDefinitions();
finishVariableDefinitions();
finishEntityDefinitions();
// Include the DWO file name in the hash if there's more than one CU.
// This handles ThinLTO's situation where imported CUs may very easily be
@ -914,25 +914,24 @@ void DwarfDebug::endModule() {
// FIXME: AbstractVariables.clear();
}
void DwarfDebug::ensureAbstractVariableIsCreated(DwarfCompileUnit &CU, InlinedVariable IV,
const MDNode *ScopeNode) {
const DILocalVariable *Cleansed = nullptr;
if (CU.getExistingAbstractVariable(IV, Cleansed))
void DwarfDebug::ensureAbstractEntityIsCreated(DwarfCompileUnit &CU,
const DINode *Node,
const MDNode *ScopeNode) {
if (CU.getExistingAbstractEntity(Node))
return;
CU.createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(
CU.createAbstractEntity(Node, LScopes.getOrCreateAbstractScope(
cast<DILocalScope>(ScopeNode)));
}
void DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(DwarfCompileUnit &CU,
InlinedVariable IV, const MDNode *ScopeNode) {
const DILocalVariable *Cleansed = nullptr;
if (CU.getExistingAbstractVariable(IV, Cleansed))
void DwarfDebug::ensureAbstractEntityIsCreatedIfScoped(DwarfCompileUnit &CU,
const DINode *Node, const MDNode *ScopeNode) {
if (CU.getExistingAbstractEntity(Node))
return;
if (LexicalScope *Scope =
LScopes.findAbstractScope(cast_or_null<DILocalScope>(ScopeNode)))
CU.createAbstractVariable(Cleansed, Scope);
CU.createAbstractEntity(Node, Scope);
}
// Collect variable information from side table maintained by MF.
@ -953,14 +952,14 @@ void DwarfDebug::collectVariableInfoFromMFTable(
if (!Scope)
continue;
ensureAbstractVariableIsCreatedIfScoped(TheCU, Var, Scope->getScopeNode());
ensureAbstractEntityIsCreatedIfScoped(TheCU, Var.first, Scope->getScopeNode());
auto RegVar = llvm::make_unique<DbgVariable>(Var.first, Var.second);
RegVar->initializeMMI(VI.Expr, VI.Slot);
if (DbgVariable *DbgVar = MFVars.lookup(Var))
DbgVar->addMMIEntry(*RegVar);
else if (InfoHolder.addScopeVariable(Scope, RegVar.get())) {
MFVars.insert({Var, RegVar.get()});
ConcreteVariables.push_back(std::move(RegVar));
ConcreteEntities.push_back(std::move(RegVar));
}
}
}
@ -1125,14 +1124,26 @@ DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
}
}
DbgVariable *DwarfDebug::createConcreteVariable(DwarfCompileUnit &TheCU,
LexicalScope &Scope,
InlinedVariable IV) {
ensureAbstractVariableIsCreatedIfScoped(TheCU, IV, Scope.getScopeNode());
ConcreteVariables.push_back(
llvm::make_unique<DbgVariable>(IV.first, IV.second));
InfoHolder.addScopeVariable(&Scope, ConcreteVariables.back().get());
return ConcreteVariables.back().get();
DbgEntity *DwarfDebug::createConcreteEntity(DwarfCompileUnit &TheCU,
LexicalScope &Scope,
const DINode *Node,
const DILocation *Location,
const MCSymbol *Sym) {
ensureAbstractEntityIsCreatedIfScoped(TheCU, Node, Scope.getScopeNode());
if (isa<const DILocalVariable>(Node)) {
ConcreteEntities.push_back(
llvm::make_unique<DbgVariable>(cast<const DILocalVariable>(Node),
Location));
InfoHolder.addScopeVariable(&Scope,
cast<DbgVariable>(ConcreteEntities.back().get()));
} else if (isa<const DILabel>(Node)) {
ConcreteEntities.push_back(
llvm::make_unique<DbgLabel>(cast<const DILabel>(Node),
Location, Sym));
InfoHolder.addScopeLabel(&Scope,
cast<DbgLabel>(ConcreteEntities.back().get()));
}
return ConcreteEntities.back().get();
}
/// Determine whether a *singular* DBG_VALUE is valid for the entirety of its
@ -1194,9 +1205,9 @@ static bool validThroughout(LexicalScopes &LScopes,
}
// Find variables for each lexical scope.
void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
const DISubprogram *SP,
DenseSet<InlinedVariable> &Processed) {
void DwarfDebug::collectEntityInfo(DwarfCompileUnit &TheCU,
const DISubprogram *SP,
DenseSet<InlinedVariable> &Processed) {
// Grab the variable info that was squirreled away in the MMI side-table.
collectVariableInfoFromMFTable(TheCU, Processed);
@ -1220,7 +1231,8 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
continue;
Processed.insert(IV);
DbgVariable *RegVar = createConcreteVariable(TheCU, *Scope, IV);
DbgVariable *RegVar = cast<DbgVariable>(createConcreteEntity(TheCU,
*Scope, IV.first, IV.second));
const MachineInstr *MInsn = Ranges.front().first;
assert(MInsn->isDebugValue() && "History must begin with debug value");
@ -1253,13 +1265,44 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
Entry.finalize(*Asm, List, BT);
}
// Collect info for variables that were optimized out.
// For each InlinedLabel collected from DBG_LABEL instructions, convert to
// DWARF-related DbgLabel.
for (const auto &I : DbgLabels) {
InlinedLabel IL = I.first;
const MachineInstr *MI = I.second;
if (MI == nullptr)
continue;
LexicalScope *Scope = nullptr;
// Get inlined DILocation if it is inlined label.
if (const DILocation *IA = IL.second)
Scope = LScopes.findInlinedScope(IL.first->getScope(), IA);
else
Scope = LScopes.findLexicalScope(IL.first->getScope());
// If label scope is not found then skip this label.
if (!Scope)
continue;
/// At this point, the temporary label is created.
/// Save the temporary label to DbgLabel entity to get the
/// actually address when generating Dwarf DIE.
MCSymbol *Sym = getLabelBeforeInsn(MI);
createConcreteEntity(TheCU, *Scope, IL.first, IL.second, Sym);
}
// Collect info for variables/labels that were optimized out.
for (const DINode *DN : SP->getRetainedNodes()) {
LexicalScope *Scope = nullptr;
if (auto *DV = dyn_cast<DILocalVariable>(DN)) {
if (Processed.insert(InlinedVariable(DV, nullptr)).second)
if (LexicalScope *Scope = LScopes.findLexicalScope(DV->getScope()))
createConcreteVariable(TheCU, *Scope, InlinedVariable(DV, nullptr));
if (!Processed.insert(InlinedVariable(DV, nullptr)).second)
continue;
Scope = LScopes.findLexicalScope(DV->getScope());
} else if (auto *DL = dyn_cast<DILabel>(DN)) {
Scope = LScopes.findLexicalScope(DL->getScope());
}
if (Scope)
createConcreteEntity(TheCU, *Scope, DN, nullptr);
}
}
@ -1417,7 +1460,7 @@ void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
DwarfCompileUnit &TheCU = *CUMap.lookup(SP->getUnit());
DenseSet<InlinedVariable> ProcessedVars;
collectVariableInfo(TheCU, SP, ProcessedVars);
collectEntityInfo(TheCU, SP, ProcessedVars);
// Add the range of this function to the list of ranges for the CU.
TheCU.addRange(RangeSpan(Asm->getFunctionBegin(), Asm->getFunctionEnd()));
@ -1445,10 +1488,11 @@ void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
// Collect info for variables that were optimized out.
if (!ProcessedVars.insert(InlinedVariable(DV, nullptr)).second)
continue;
ensureAbstractVariableIsCreated(TheCU, InlinedVariable(DV, nullptr),
DV->getScope());
ensureAbstractEntityIsCreated(TheCU, DV, DV->getScope());
assert(LScopes.getAbstractScopesList().size() == NumAbstractScopes
&& "ensureAbstractVariableIsCreated inserted abstract scopes");
&& "ensureAbstractEntityIsCreated inserted abstract scopes");
} else if (auto *DL = dyn_cast<DILabel>(DN)) {
ensureAbstractEntityIsCreated(TheCU, DL, DL->getScope());
}
}
constructAbstractSubprogramScopeDIE(TheCU, AScope);
@ -1466,6 +1510,7 @@ void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
// DbgVariables except those that are also in AbstractVariables (since they
// can be used cross-function)
InfoHolder.getScopeVariables().clear();
InfoHolder.getScopeLabels().clear();
PrevLabel = nullptr;
CurFn = nullptr;
}

136
llvm/lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -15,7 +15,7 @@
#define LLVM_LIB_CODEGEN_ASMPRINTER_DWARFDEBUG_H
#include "AddressPool.h"
#include "DbgValueHistoryCalculator.h"
#include "DbgEntityHistoryCalculator.h"
#include "DebugHandlerBase.h"
#include "DebugLocStream.h"
#include "DwarfFile.h"
@ -61,6 +61,46 @@ class MCSymbol;
class MDNode;
class Module;
//===----------------------------------------------------------------------===//
/// This class is defined as the common parent of DbgVariable and DbgLabel
/// such that it could levarage polymorphism to extract common code for
/// DbgVariable and DbgLabel.
class DbgEntity {
const DINode *Entity;
const DILocation *InlinedAt;
DIE *TheDIE = nullptr;
unsigned SubclassID;
public:
enum DbgEntityKind {
DbgVariableKind,
DbgLabelKind
};
DbgEntity(const DINode *N, const DILocation *IA, unsigned ID)
: Entity(N), InlinedAt(IA), SubclassID(ID) {}
/// Accessors.
/// @{
const DINode *getEntity() const { return Entity; }
const DILocation *getInlinedAt() const { return InlinedAt; }
DIE *getDIE() const { return TheDIE; }
unsigned getDbgEntityID() const { return SubclassID; }
/// @}
void setDIE(DIE &D) { TheDIE = &D; }
static bool classof(const DbgEntity *N) {
switch (N->getDbgEntityID()) {
default:
return false;
case DbgVariableKind:
case DbgLabelKind:
return true;
}
}
};
//===----------------------------------------------------------------------===//
/// This class is used to track local variable information.
///
@ -73,10 +113,7 @@ class Module;
/// single instruction use \a MInsn and (optionally) a single entry of \a Expr.
///
/// Variables that have been optimized out use none of these fields.
class DbgVariable {
const DILocalVariable *Var; /// Variable Descriptor.
const DILocation *IA; /// Inlined at location.
DIE *TheDIE = nullptr; /// Variable DIE.
class DbgVariable : public DbgEntity {
unsigned DebugLocListIndex = ~0u; /// Offset in DebugLocs.
const MachineInstr *MInsn = nullptr; /// DBG_VALUE instruction.
@ -93,7 +130,7 @@ public:
/// Creates a variable without any DW_AT_location. Call \a initializeMMI()
/// for MMI entries, or \a initializeDbgValue() for DBG_VALUE instructions.
DbgVariable(const DILocalVariable *V, const DILocation *IA)
: Var(V), IA(IA) {}
: DbgEntity(V, IA, DbgVariableKind) {}
/// Initialize from the MMI table.
void initializeMMI(const DIExpression *E, int FI) {
@ -111,8 +148,9 @@ public:
assert(FrameIndexExprs.empty() && "Already initialized?");
assert(!MInsn && "Already initialized?");
assert(Var == DbgValue->getDebugVariable() && "Wrong variable");
assert(IA == DbgValue->getDebugLoc()->getInlinedAt() && "Wrong inlined-at");
assert(getVariable() == DbgValue->getDebugVariable() && "Wrong variable");
assert(getInlinedAt() == DbgValue->getDebugLoc()->getInlinedAt() &&
"Wrong inlined-at");
MInsn = DbgValue;
if (auto *E = DbgValue->getDebugExpression())
@ -121,19 +159,18 @@ public:
}
// Accessors.
const DILocalVariable *getVariable() const { return Var; }
const DILocation *getInlinedAt() const { return IA; }
const DILocalVariable *getVariable() const {
return cast<DILocalVariable>(getEntity());
}
const DIExpression *getSingleExpression() const {
assert(MInsn && FrameIndexExprs.size() <= 1);
return FrameIndexExprs.size() ? FrameIndexExprs[0].Expr : nullptr;
}
void setDIE(DIE &D) { TheDIE = &D; }
DIE *getDIE() const { return TheDIE; }
void setDebugLocListIndex(unsigned O) { DebugLocListIndex = O; }
unsigned getDebugLocListIndex() const { return DebugLocListIndex; }
StringRef getName() const { return Var->getName(); }
StringRef getName() const { return getVariable()->getName(); }
const MachineInstr *getMInsn() const { return MInsn; }
/// Get the FI entries, sorted by fragment offset.
ArrayRef<FrameIndexExpr> getFrameIndexExprs() const;
@ -143,7 +180,7 @@ public:
// Translate tag to proper Dwarf tag.
dwarf::Tag getTag() const {
// FIXME: Why don't we just infer this tag and store it all along?
if (Var->isParameter())
if (getVariable()->isParameter())
return dwarf::DW_TAG_formal_parameter;
return dwarf::DW_TAG_variable;
@ -151,7 +188,7 @@ public:
/// Return true if DbgVariable is artificial.
bool isArtificial() const {
if (Var->isArtificial())
if (getVariable()->isArtificial())
return true;
if (getType()->isArtificial())
return true;
@ -159,7 +196,7 @@ public:
}
bool isObjectPointer() const {
if (Var->isObjectPointer())
if (getVariable()->isObjectPointer())
return true;
if (getType()->isObjectPointer())
return true;
@ -178,6 +215,45 @@ public:
bool isBlockByrefVariable() const;
const DIType *getType() const;
static bool classof(const DbgEntity *N) {
return N->getDbgEntityID() == DbgVariableKind;
}
private:
template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
return Ref.resolve();
}
};
//===----------------------------------------------------------------------===//
/// This class is used to track label information.
///
/// Labels are collected from \c DBG_LABEL instructions.
class DbgLabel : public DbgEntity {
const MCSymbol *Sym; /// Symbol before DBG_LABEL instruction.
public:
/// We need MCSymbol information to generate DW_AT_low_pc.
DbgLabel(const DILabel *L, const DILocation *IA, const MCSymbol *Sym = nullptr)
: DbgEntity(L, IA, DbgLabelKind), Sym(Sym) {}
/// Accessors.
/// @{
const DILabel *getLabel() const { return cast<DILabel>(getEntity()); }
const MCSymbol *getSymbol() const { return Sym; }
StringRef getName() const { return getLabel()->getName(); }
/// @}
/// Translate tag to proper Dwarf tag.
dwarf::Tag getTag() const {
return dwarf::DW_TAG_label;
}
static bool classof(const DbgEntity *N) {
return N->getDbgEntityID() == DbgLabelKind;
}
private:
template <typename T> T *resolve(TypedDINodeRef<T> Ref) const {
return Ref.resolve();
@ -217,8 +293,8 @@ class DwarfDebug : public DebugHandlerBase {
/// Size of each symbol emitted (for those symbols that have a specific size).
DenseMap<const MCSymbol *, uint64_t> SymSize;
/// Collection of abstract variables.
SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
/// Collection of abstract variables/labels.
SmallVector<std::unique_ptr<DbgEntity>, 64> ConcreteEntities;
/// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
/// can refer to them in spite of insertions into this list.
@ -333,14 +409,20 @@ class DwarfDebug : public DebugHandlerBase {
}
using InlinedVariable = DbgValueHistoryMap::InlinedVariable;
using InlinedLabel = DbgLabelInstrMap::InlinedLabel;
void ensureAbstractVariableIsCreated(DwarfCompileUnit &CU, InlinedVariable IV,
const MDNode *Scope);
void ensureAbstractVariableIsCreatedIfScoped(DwarfCompileUnit &CU, InlinedVariable IV,
const MDNode *Scope);
void ensureAbstractEntityIsCreated(DwarfCompileUnit &CU,
const DINode *Node,
const MDNode *Scope);
void ensureAbstractEntityIsCreatedIfScoped(DwarfCompileUnit &CU,
const DINode *Node,
const MDNode *Scope);
DbgVariable *createConcreteVariable(DwarfCompileUnit &TheCU,
LexicalScope &Scope, InlinedVariable IV);
DbgEntity *createConcreteEntity(DwarfCompileUnit &TheCU,
LexicalScope &Scope,
const DINode *Node,
const DILocation *Location,
const MCSymbol *Sym = nullptr);
/// Construct a DIE for this abstract scope.
void constructAbstractSubprogramScopeDIE(DwarfCompileUnit &SrcCU, LexicalScope *Scope);
@ -349,7 +431,7 @@ class DwarfDebug : public DebugHandlerBase {
void addAccelNameImpl(AccelTable<DataT> &AppleAccel, StringRef Name,
const DIE &Die);
void finishVariableDefinitions();
void finishEntityDefinitions();
void finishSubprogramDefinitions();
@ -466,8 +548,8 @@ class DwarfDebug : public DebugHandlerBase {
unsigned Flags);
/// Populate LexicalScope entries with variables' info.
void collectVariableInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
DenseSet<InlinedVariable> &ProcessedVars);
void collectEntityInfo(DwarfCompileUnit &TheCU, const DISubprogram *SP,
DenseSet<InlinedVariable> &ProcessedVars);
/// Build the location list for all DBG_VALUEs in the
/// function that describe the same variable.

5
llvm/lib/CodeGen/AsmPrinter/DwarfFile.cpp
View File

@ -98,3 +98,8 @@ bool DwarfFile::addScopeVariable(LexicalScope *LS, DbgVariable *Var) {
}
return true;
}
void DwarfFile::addScopeLabel(LexicalScope *LS, DbgLabel *Label) {
SmallVectorImpl<DbgLabel *> &Labels = ScopeLabels[LS];
Labels.push_back(Label);
}

18
llvm/lib/CodeGen/AsmPrinter/DwarfFile.h
View File

@ -24,7 +24,9 @@
namespace llvm {
class AsmPrinter;
class DbgEntity;
class DbgVariable;
class DbgLabel;
class DwarfCompileUnit;
class DwarfUnit;
class LexicalScope;
@ -62,9 +64,13 @@ class DwarfFile {
/// Collection of DbgVariables of each lexical scope.
DenseMap<LexicalScope *, ScopeVars> ScopeVariables;
/// Collection of DbgLabels of each lexical scope.
using LabelList = SmallVector<DbgLabel *, 4>;
DenseMap<LexicalScope *, LabelList> ScopeLabels;
// Collection of abstract subprogram DIEs.
DenseMap<const MDNode *, DIE *> AbstractSPDies;
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
DenseMap<const DINode *, std::unique_ptr<DbgEntity>> AbstractEntities;
/// Maps MDNodes for type system with the corresponding DIEs. These DIEs can
/// be shared across CUs, that is why we keep the map here instead
@ -122,16 +128,22 @@ public:
/// \returns false if the variable was merged with a previous one.
bool addScopeVariable(LexicalScope *LS, DbgVariable *Var);
void addScopeLabel(LexicalScope *LS, DbgLabel *Label);
DenseMap<LexicalScope *, ScopeVars> &getScopeVariables() {
return ScopeVariables;
}
DenseMap<LexicalScope *, LabelList> &getScopeLabels() {
return ScopeLabels;
}
DenseMap<const MDNode *, DIE *> &getAbstractSPDies() {
return AbstractSPDies;
}
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> &getAbstractVariables() {
return AbstractVariables;
DenseMap<const DINode *, std::unique_ptr<DbgEntity>> &getAbstractEntities() {
return AbstractEntities;
}
void insertDIE(const MDNode *TypeMD, DIE *Die) {

6
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -401,6 +401,12 @@ void DwarfUnit::addSourceLine(DIE &Die, const DISubprogram *SP) {
addSourceLine(Die, SP->getLine(), SP->getFile());
}
void DwarfUnit::addSourceLine(DIE &Die, const DILabel *L) {
assert(L);
addSourceLine(Die, L->getLine(), L->getFile());
}
void DwarfUnit::addSourceLine(DIE &Die, const DIType *Ty) {
assert(Ty);

1
llvm/lib/CodeGen/AsmPrinter/DwarfUnit.h
View File

@ -213,6 +213,7 @@ public:
void addSourceLine(DIE &Die, const DILocalVariable *V);
void addSourceLine(DIE &Die, const DIGlobalVariable *G);
void addSourceLine(DIE &Die, const DISubprogram *SP);
void addSourceLine(DIE &Die, const DILabel *L);
void addSourceLine(DIE &Die, const DIType *Ty);
void addSourceLine(DIE &Die, const DIObjCProperty *Ty);

11
llvm/lib/CodeGen/GlobalISel/IRTranslator.cpp
View File

@ -766,6 +766,17 @@ bool IRTranslator::translateKnownIntrinsic(const CallInst &CI, Intrinsic::ID ID,
DI.getVariable(), DI.getExpression());
return true;
}
case Intrinsic::dbg_label: {
const DbgLabelInst &DI = cast<DbgLabelInst>(CI);
assert(DI.getLabel() && "Missing label");
assert(DI.getLabel()->isValidLocationForIntrinsic(
MIRBuilder.getDebugLoc()) &&
"Expected inlined-at fields to agree");
MIRBuilder.buildDbgLabel(DI.getLabel());
return true;
}
case Intrinsic::vaend:
// No target I know of cares about va_end. Certainly no in-tree target
// does. Simplest intrinsic ever!

9
llvm/lib/CodeGen/GlobalISel/MachineIRBuilder.cpp
View File

@ -149,6 +149,15 @@ MachineInstrBuilder MachineIRBuilderBase::buildConstDbgValue(
return MIB.addImm(0).addMetadata(Variable).addMetadata(Expr);
}
MachineInstrBuilder MachineIRBuilderBase::buildDbgLabel(const MDNode *Label) {
assert(isa<DILabel>(Label) && "not a label");
assert(cast<DILabel>(Label)->isValidLocationForIntrinsic(State.DL) &&
"Expected inlined-at fields to agree");
auto MIB = buildInstr(TargetOpcode::DBG_LABEL);
return MIB.addMetadata(Label);
}
MachineInstrBuilder MachineIRBuilderBase::buildFrameIndex(unsigned Res,
int Idx) {
assert(getMRI()->getType(Res).isPointer() && "invalid operand type");

50
llvm/test/DebugInfo/Generic/debug-label-inline.ll Normal file
View File

@ -0,0 +1,50 @@
; RUN: llc -O2 -filetype=obj -o - %s | llvm-dwarfdump -v - | FileCheck %s
;
; CHECK: .debug_info contents:
; CHECK: [[LABEL_ORIGIN:0x[0-9a-zA-Z]+]]:{{ *}}DW_TAG_label
; CHECK-NEXT: DW_AT_name [DW_FORM_strp] {{.*}}"top"
; CHECK-NEXT: DW_AT_decl_file [DW_FORM_data1] {{.*}}debug-label-inline.c
; CHECK-NEXT: DW_AT_decl_line [DW_FORM_data1] {{.*}}8
; CHECK: DW_TAG_label
; CHECK-NEXT: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{[[LABEL_ORIGIN]]} "top"
; CHECK-NEXT: DW_AT_low_pc [DW_FORM_addr] {{.*}}{{0x[0-9a-f]+}}
source_filename = "debug-label-inline.c"
@ga = external local_unnamed_addr global i32, align 4
@gb = external local_unnamed_addr global i32, align 4
define i32 @f2() local_unnamed_addr #0 !dbg !4 {
entry:
%0 = load i32, i32* @ga, align 4, !dbg !1
%1 = load i32, i32* @gb, align 4, !dbg !1
call void @llvm.dbg.label(metadata !15), !dbg !17
%add.i = add nsw i32 %1, %0, !dbg !18
ret i32 %add.i, !dbg !1
}
declare void @llvm.dbg.label(metadata)
declare void @llvm.dbg.value(metadata, metadata, metadata)
attributes #0 = { nounwind readonly }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !6, isOptimized: true, emissionKind: FullDebug, enums: !2)
!1 = !DILocation(line: 18, scope: !4)
!2 = !{}
!3 = !{i32 2, !"Debug Info Version", i32 3}
!4 = distinct !DISubprogram(name: "f2", scope: !6, file: !6, line: 15, type: !7, isLocal: false, isDefinition: true, scopeLine: 15, isOptimized: true, unit: !0, retainedNodes: !2)
!6 = !DIFile(filename: "debug-label-inline.c", directory: "./")
!7 = !DISubroutineType(types: !8)
!8 = !{!10}
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = distinct !DISubprogram(name: "f1", scope: !6, file: !6, line: 5, type: !12, isLocal: false, isDefinition: true, scopeLine: 5, isOptimized: true, unit: !0, retainedNodes: !14)
!12 = !DISubroutineType(types: !13)
!13 = !{!10, !10, !10}
!14 = !{!15}
!15 = !DILabel(scope: !11, name: "top", file: !6, line: 8)
!16 = distinct !DILocation(line: 18, scope: !4)
!17 = !DILocation(line: 8, scope: !11, inlinedAt: !16)
!18 = !DILocation(line: 9, scope: !11, inlinedAt: !16)

76
llvm/test/DebugInfo/Generic/debug-label.ll Normal file
View File

@ -0,0 +1,76 @@
; RUN: llc -fast-isel=false -O0 -filetype=obj -o - %s | llvm-dwarfdump -v - | FileCheck %s
;
; CHECK: .debug_info contents:
; CHECK: DW_TAG_label
; CHECK-NEXT: DW_AT_name [DW_FORM_strp] {{.*}}"top"
; CHECK-NEXT: DW_AT_decl_file [DW_FORM_data1] {{.*}}debug-label.c
; CHECK-NEXT: DW_AT_decl_line [DW_FORM_data1] {{.*}}4
; CHECK-NEXT: DW_AT_low_pc [DW_FORM_addr] {{.*}}{{0x[0-9a-f]+}}
; CHECK: DW_TAG_label
; CHECK-NEXT: DW_AT_name [DW_FORM_strp] {{.*}}"done"
; CHECK-NEXT: DW_AT_decl_file [DW_FORM_data1] {{.*}}debug-label.c
; CHECK-NEXT: DW_AT_decl_line [DW_FORM_data1] {{.*}}7
; CHECK-NEXT: DW_AT_low_pc [DW_FORM_addr] {{.*}}{{0x[0-9a-f]+}}
;
; RUN: llc -fast-isel=false -O0 -o - %s | FileCheck %s -check-prefix=ASM
;
; ASM: [[TOP_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:top
; ASM: [[DONE_LOW_PC:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}DEBUG_LABEL: foo:done
; ASM-LABEL: .debug_str
; ASM: [[TOP_LABEL:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}"top"
; ASM: [[DONE_LABEL:[.0-9a-zA-Z]+]]:{{[[:space:]].*}}"done"
; ASM-LABEL: .debug_info
; ASM: DW_TAG_label
; ASM-NEXT: [[TOP_LABEL]] # DW_AT_name
; ASM-NEXT: 1 # DW_AT_decl_file
; ASM-NEXT: 4 # DW_AT_decl_line
; ASM-NEXT: [[TOP_LOW_PC]] # DW_AT_low_pc
; ASM: DW_TAG_label
; ASM-NEXT: [[DONE_LABEL]] # DW_AT_name
; ASM-NEXT: 1 # DW_AT_decl_file
; ASM-NEXT: 7 # DW_AT_decl_line
; ASM-NEXT: [[DONE_LOW_PC]] # DW_AT_low_pc
source_filename = "debug-label.c"
define dso_local i32 @foo(i32 %a, i32 %b) !dbg !6 {
entry:
%a.addr = alloca i32, align 4
%b.addr = alloca i32, align 4
%sum = alloca i32, align 4
store i32 %a, i32* %a.addr, align 4
store i32 %b, i32* %b.addr, align 4
br label %top
top:
call void @llvm.dbg.label(metadata !10), !dbg !11
%0 = load i32, i32* %a.addr, align 4
%1 = load i32, i32* %b.addr, align 4
%add = add nsw i32 %0, %1
store i32 %add, i32* %sum, align 4
br label %done
done:
call void @llvm.dbg.label(metadata !12), !dbg !13
%2 = load i32, i32* %sum, align 4
ret i32 %2, !dbg !14
}
declare void @llvm.dbg.label(metadata)
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!4}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, isOptimized: false, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "debug-label.c", directory: "./")
!2 = !{}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!6 = distinct !DISubprogram(name: "foo", scope: !1, file: !1, line: 1, type: !7, isLocal: false, isDefinition: true, scopeLine: 2, isOptimized: false, unit: !0, retainedNodes: !2)
!7 = !DISubroutineType(types: !8)
!8 = !{!9, !9, !9}
!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!10 = !DILabel(scope: !6, name: "top", file: !1, line: 4)
!11 = !DILocation(line: 4, column: 1, scope: !6)
!12 = !DILabel(scope: !6, name: "done", file: !1, line: 7)
!13 = !DILocation(line: 7, column: 1, scope: !6)
!14 = !DILocation(line: 8, column: 3, scope: !6)