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DWARF: Avoid cross-CU references under Fission

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Turns out that the Fission/Split DWARF package format (DWP) is currently
insufficient to handle cross-CU (ref_addr) references. So for now,
duplicate any debug info needed in these situations:
* inlined_subroutine's abstract_origin
* inlined variable's abstract_origin
* types

Keep the ref_addr behavior in general, including in the split DWARF
inline debug info that can be emitted into the object files for online
symbolication.
Keep a flag to use the old (ref_addr) behavior for testing ways of
addressing this limitation in the DWP tool (& for those not using DWP
packaging).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302858 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
David Blaikie 2017-05-12 01:13:45 +00:00
parent 022fc8e3fd
commit 054c35d6a2
8 changed files with 291 additions and 97 deletions
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42
lib/CodeGen/AsmPrinter/DwarfCompileUnit.cpp
View File

@ -440,7 +440,7 @@ DIE *DwarfCompileUnit::constructInlinedScopeDIE(LexicalScope *Scope) {
auto *InlinedSP = getDISubprogram(DS);
// Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
// was inlined from another compile unit.
DIE *OriginDIE = DU->getAbstractSPDies()[InlinedSP];
DIE *OriginDIE = getAbstractSPDies()[InlinedSP];
assert(OriginDIE && "Unable to find original DIE for an inlined subprogram.");
auto ScopeDIE = DIE::get(DIEValueAllocator, dwarf::DW_TAG_inlined_subroutine);
@ -634,7 +634,7 @@ DIE *DwarfCompileUnit::createAndAddScopeChildren(LexicalScope *Scope,
void DwarfCompileUnit::constructAbstractSubprogramScopeDIE(
LexicalScope *Scope) {
DIE *&AbsDef = DU->getAbstractSPDies()[Scope->getScopeNode()];
DIE *&AbsDef = getAbstractSPDies()[Scope->getScopeNode()];
if (AbsDef)
return;
@ -696,7 +696,7 @@ DIE *DwarfCompileUnit::constructImportedEntityDIE(
void DwarfCompileUnit::finishSubprogramDefinition(const DISubprogram *SP) {
DIE *D = getDIE(SP);
if (DIE *AbsSPDIE = DU->getAbstractSPDies().lookup(SP)) {
if (DIE *AbsSPDIE = getAbstractSPDies().lookup(SP)) {
if (D)
// If this subprogram has an abstract definition, reference that
addDIEEntry(*D, dwarf::DW_AT_abstract_origin, *AbsSPDIE);
@ -708,6 +708,42 @@ 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);
}
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())
return I->second.get();
return nullptr;
}
void DwarfCompileUnit::createAbstractVariable(const DILocalVariable *Var,
LexicalScope *Scope) {
assert(Scope && Scope->isAbstractScope());
auto AbsDbgVariable = make_unique<DbgVariable>(Var, /* IA */ nullptr);
DU->addScopeVariable(Scope, AbsDbgVariable.get());
getAbstractVariables()[Var] = std::move(AbsDbgVariable);
}
void DwarfCompileUnit::emitHeader(bool UseOffsets) {
// Don't bother labeling the .dwo unit, as its offset isn't used.
if (!Skeleton) {

22
lib/CodeGen/AsmPrinter/DwarfCompileUnit.h
View File

@ -68,6 +68,9 @@ class DwarfCompileUnit final : public DwarfUnit {
// ranges/locs.
const MCSymbol *BaseAddress;
DenseMap<const MDNode *, DIE *> AbstractSPDies;
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
/// \brief Construct a DIE for the given DbgVariable without initializing the
/// DbgVariable's DIE reference.
DIE *constructVariableDIEImpl(const DbgVariable &DV, bool Abstract);
@ -76,6 +79,18 @@ class DwarfCompileUnit final : public DwarfUnit {
bool includeMinimalInlineScopes() const;
DenseMap<const MDNode *, DIE *> &getAbstractSPDies() {
if (isDwoUnit() && !DD->shareAcrossDWOCUs())
return AbstractSPDies;
return DU->getAbstractSPDies();
}
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> &getAbstractVariables() {
if (isDwoUnit() && !DD->shareAcrossDWOCUs())
return AbstractVariables;
return DU->getAbstractVariables();
}
public:
DwarfCompileUnit(unsigned UID, const DICompileUnit *Node, AsmPrinter *A,
DwarfDebug *DW, DwarfFile *DWU);
@ -189,6 +204,13 @@ public:
DIE *constructImportedEntityDIE(const DIImportedEntity *Module);
void finishSubprogramDefinition(const DISubprogram *SP);
void finishVariableDefinition(const DbgVariable &Var);
/// Find abstract variable associated with Var.
typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
const DILocalVariable *&Cleansed);
DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
/// Set the skeleton unit associated with this unit.
void setSkeleton(DwarfCompileUnit &Skel) { Skeleton = &Skel; }

89
lib/CodeGen/AsmPrinter/DwarfDebug.cpp
View File

@ -71,6 +71,10 @@ static cl::opt<bool> GenerateARangeSection("generate-arange-section",
cl::desc("Generate dwarf aranges"),
cl::init(false));
static cl::opt<bool> SplitDwarfCrossCuReferences(
"split-dwarf-cross-cu-references", cl::Hidden,
cl::desc("Enable cross-cu references in DWO files"), cl::init(false));
namespace {
enum DefaultOnOff { Default, Enable, Disable };
}
@ -362,21 +366,29 @@ template <typename Func> static void forBothCUs(DwarfCompileUnit &CU, Func F) {
F(*SkelCU);
}
void DwarfDebug::constructAbstractSubprogramScopeDIE(LexicalScope *Scope) {
bool DwarfDebug::shareAcrossDWOCUs() const {
return SplitDwarfCrossCuReferences;
}
void DwarfDebug::constructAbstractSubprogramScopeDIE(DwarfCompileUnit &SrcCU,
LexicalScope *Scope) {
assert(Scope && Scope->getScopeNode());
assert(Scope->isAbstractScope());
assert(!Scope->getInlinedAt());
auto *SP = cast<DISubprogram>(Scope->getScopeNode());
ProcessedSPNodes.insert(SP);
// Find the subprogram's DwarfCompileUnit in the SPMap in case the subprogram
// was inlined from another compile unit.
auto &CU = *CUMap.lookup(SP->getUnit());
forBothCUs(CU, [&](DwarfCompileUnit &CU) {
if (auto *SkelCU = CU.getSkeleton()) {
(shareAcrossDWOCUs() ? CU : SrcCU)
.constructAbstractSubprogramScopeDIE(Scope);
if (CU.getCUNode()->getSplitDebugInlining())
SkelCU->constructAbstractSubprogramScopeDIE(Scope);
} else {
CU.constructAbstractSubprogramScopeDIE(Scope);
});
}
}
void DwarfDebug::addGnuPubAttributes(DwarfUnit &U, DIE &D) const {
@ -564,13 +576,7 @@ void DwarfDebug::finishVariableDefinitions() {
// DIE::getUnit isn't simple - it walks parent pointers, etc.
DwarfCompileUnit *Unit = CUDieMap.lookup(VariableDie->getUnitDie());
assert(Unit);
DbgVariable *AbsVar = getExistingAbstractVariable(
InlinedVariable(Var->getVariable(), Var->getInlinedAt()));
if (AbsVar && AbsVar->getDIE()) {
Unit->addDIEEntry(*VariableDie, dwarf::DW_AT_abstract_origin,
*AbsVar->getDIE());
} else
Unit->applyVariableAttributes(*Var, *VariableDie);
Unit->finishVariableDefinition(*Var);
}
}
@ -718,58 +724,32 @@ void DwarfDebug::endModule() {
}
// clean up.
AbstractVariables.clear();
// FIXME: AbstractVariables.clear();
}
// Find abstract variable, if any, associated with Var.
DbgVariable *
DwarfDebug::getExistingAbstractVariable(InlinedVariable IV,
const DILocalVariable *&Cleansed) {
// More then one inlined variable corresponds to one abstract variable.
Cleansed = IV.first;
auto I = AbstractVariables.find(Cleansed);
if (I != AbstractVariables.end())
return I->second.get();
return nullptr;
}
DbgVariable *DwarfDebug::getExistingAbstractVariable(InlinedVariable IV) {
const DILocalVariable *Cleansed;
return getExistingAbstractVariable(IV, Cleansed);
}
void DwarfDebug::createAbstractVariable(const DILocalVariable *Var,
LexicalScope *Scope) {
assert(Scope && Scope->isAbstractScope());
auto AbsDbgVariable = make_unique<DbgVariable>(Var, /* IA */ nullptr);
InfoHolder.addScopeVariable(Scope, AbsDbgVariable.get());
AbstractVariables[Var] = std::move(AbsDbgVariable);
}
void DwarfDebug::ensureAbstractVariableIsCreated(InlinedVariable IV,
void DwarfDebug::ensureAbstractVariableIsCreated(DwarfCompileUnit &CU, InlinedVariable IV,
const MDNode *ScopeNode) {
const DILocalVariable *Cleansed = nullptr;
if (getExistingAbstractVariable(IV, Cleansed))
if (CU.getExistingAbstractVariable(IV, Cleansed))
return;
createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(
CU.createAbstractVariable(Cleansed, LScopes.getOrCreateAbstractScope(
cast<DILocalScope>(ScopeNode)));
}
void DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(
void DwarfDebug::ensureAbstractVariableIsCreatedIfScoped(DwarfCompileUnit &CU,
InlinedVariable IV, const MDNode *ScopeNode) {
const DILocalVariable *Cleansed = nullptr;
if (getExistingAbstractVariable(IV, Cleansed))
if (CU.getExistingAbstractVariable(IV, Cleansed))
return;
if (LexicalScope *Scope =
LScopes.findAbstractScope(cast_or_null<DILocalScope>(ScopeNode)))
createAbstractVariable(Cleansed, Scope);
CU.createAbstractVariable(Cleansed, Scope);
}
// Collect variable information from side table maintained by MF.
void DwarfDebug::collectVariableInfoFromMFTable(
DenseSet<InlinedVariable> &Processed) {
DwarfCompileUnit &TheCU, DenseSet<InlinedVariable> &Processed) {
for (const auto &VI : Asm->MF->getVariableDbgInfo()) {
if (!VI.Var)
continue;
@ -784,7 +764,7 @@ void DwarfDebug::collectVariableInfoFromMFTable(
if (!Scope)
continue;
ensureAbstractVariableIsCreatedIfScoped(Var, Scope->getScopeNode());
ensureAbstractVariableIsCreatedIfScoped(TheCU, Var, Scope->getScopeNode());
auto RegVar = make_unique<DbgVariable>(Var.first, Var.second);
RegVar->initializeMMI(VI.Expr, VI.Slot);
if (InfoHolder.addScopeVariable(Scope, RegVar.get()))
@ -955,9 +935,10 @@ DwarfDebug::buildLocationList(SmallVectorImpl<DebugLocEntry> &DebugLoc,
}
}
DbgVariable *DwarfDebug::createConcreteVariable(LexicalScope &Scope,
DbgVariable *DwarfDebug::createConcreteVariable(DwarfCompileUnit &TheCU,
LexicalScope &Scope,
InlinedVariable IV) {
ensureAbstractVariableIsCreatedIfScoped(IV, Scope.getScopeNode());
ensureAbstractVariableIsCreatedIfScoped(TheCU, IV, Scope.getScopeNode());
ConcreteVariables.push_back(make_unique<DbgVariable>(IV.first, IV.second));
InfoHolder.addScopeVariable(&Scope, ConcreteVariables.back().get());
return ConcreteVariables.back().get();
@ -980,7 +961,7 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
const DISubprogram *SP,
DenseSet<InlinedVariable> &Processed) {
// Grab the variable info that was squirreled away in the MMI side-table.
collectVariableInfoFromMFTable(Processed);
collectVariableInfoFromMFTable(TheCU, Processed);
for (const auto &I : DbgValues) {
InlinedVariable IV = I.first;
@ -1002,7 +983,7 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
continue;
Processed.insert(IV);
DbgVariable *RegVar = createConcreteVariable(*Scope, IV);
DbgVariable *RegVar = createConcreteVariable(TheCU, *Scope, IV);
const MachineInstr *MInsn = Ranges.front().first;
assert(MInsn->isDebugValue() && "History must begin with debug value");
@ -1038,7 +1019,7 @@ void DwarfDebug::collectVariableInfo(DwarfCompileUnit &TheCU,
for (const DILocalVariable *DV : SP->getVariables()) {
if (Processed.insert(InlinedVariable(DV, nullptr)).second)
if (LexicalScope *Scope = LScopes.findLexicalScope(DV->getScope()))
createConcreteVariable(*Scope, InlinedVariable(DV, nullptr));
createConcreteVariable(TheCU, *Scope, InlinedVariable(DV, nullptr));
}
}
@ -1229,12 +1210,12 @@ void DwarfDebug::endFunctionImpl(const MachineFunction *MF) {
for (const DILocalVariable *DV : SP->getVariables()) {
if (!ProcessedVars.insert(InlinedVariable(DV, nullptr)).second)
continue;
ensureAbstractVariableIsCreated(InlinedVariable(DV, nullptr),
ensureAbstractVariableIsCreated(TheCU, InlinedVariable(DV, nullptr),
DV->getScope());
assert(LScopes.getAbstractScopesList().size() == NumAbstractScopes
&& "ensureAbstractVariableIsCreated inserted abstract scopes");
}
constructAbstractSubprogramScopeDIE(AScope);
constructAbstractSubprogramScopeDIE(TheCU, AScope);
}
ProcessedSPNodes.insert(SP);

20
lib/CodeGen/AsmPrinter/DwarfDebug.h
View File

@ -210,7 +210,6 @@ class DwarfDebug : public DebugHandlerBase {
DenseMap<const MCSymbol *, uint64_t> SymSize;
/// Collection of abstract variables.
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
SmallVector<std::unique_ptr<DbgVariable>, 64> ConcreteVariables;
/// Collection of DebugLocEntry. Stored in a linked list so that DIELocLists
@ -313,20 +312,16 @@ class DwarfDebug : public DebugHandlerBase {
typedef DbgValueHistoryMap::InlinedVariable InlinedVariable;
/// Find abstract variable associated with Var.
DbgVariable *getExistingAbstractVariable(InlinedVariable IV,
const DILocalVariable *&Cleansed);
DbgVariable *getExistingAbstractVariable(InlinedVariable IV);
void createAbstractVariable(const DILocalVariable *DV, LexicalScope *Scope);
void ensureAbstractVariableIsCreated(InlinedVariable Var,
void ensureAbstractVariableIsCreated(DwarfCompileUnit &CU, InlinedVariable Var,
const MDNode *Scope);
void ensureAbstractVariableIsCreatedIfScoped(InlinedVariable Var,
void ensureAbstractVariableIsCreatedIfScoped(DwarfCompileUnit &CU, InlinedVariable Var,
const MDNode *Scope);
DbgVariable *createConcreteVariable(LexicalScope &Scope, InlinedVariable IV);
DbgVariable *createConcreteVariable(DwarfCompileUnit &TheCU,
LexicalScope &Scope, InlinedVariable IV);
/// Construct a DIE for this abstract scope.
void constructAbstractSubprogramScopeDIE(LexicalScope *Scope);
void constructAbstractSubprogramScopeDIE(DwarfCompileUnit &SrcCU, LexicalScope *Scope);
void finishVariableDefinitions();
@ -446,7 +441,8 @@ class DwarfDebug : public DebugHandlerBase {
const DbgValueHistoryMap::InstrRanges &Ranges);
/// Collect variable information from the side table maintained by MF.
void collectVariableInfoFromMFTable(DenseSet<InlinedVariable> &P);
void collectVariableInfoFromMFTable(DwarfCompileUnit &TheCU,
DenseSet<InlinedVariable> &P);
protected:
/// Gather pre-function debug information.
@ -518,6 +514,8 @@ public:
/// split dwarf proposal support.
bool useSplitDwarf() const { return HasSplitDwarf; }
bool shareAcrossDWOCUs() const;
/// Returns the Dwarf Version.
uint16_t getDwarfVersion() const;

4
lib/CodeGen/AsmPrinter/DwarfFile.h
View File

@ -53,6 +53,7 @@ class DwarfFile {
// Collection of abstract subprogram DIEs.
DenseMap<const MDNode *, DIE *> AbstractSPDies;
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> AbstractVariables;
/// 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
@ -105,6 +106,9 @@ public:
DenseMap<const MDNode *, DIE *> &getAbstractSPDies() {
return AbstractSPDies;
}
DenseMap<const MDNode *, std::unique_ptr<DbgVariable>> &getAbstractVariables() {
return AbstractVariables;
}
void insertDIE(const MDNode *TypeMD, DIE *Die) {
DITypeNodeToDieMap.insert(std::make_pair(TypeMD, Die));

4
lib/CodeGen/AsmPrinter/DwarfUnit.cpp
View File

@ -173,7 +173,7 @@ int64_t DwarfUnit::getDefaultLowerBound() const {
}
/// Check whether the DIE for this MDNode can be shared across CUs.
static bool isShareableAcrossCUs(const DINode *D) {
bool DwarfUnit::isShareableAcrossCUs(const DINode *D) const {
// When the MDNode can be part of the type system, the DIE can be shared
// across CUs.
// Combining type units and cross-CU DIE sharing is lower value (since
@ -181,6 +181,8 @@ static bool isShareableAcrossCUs(const DINode *D) {
// level already) but may be implementable for some value in projects
// building multiple independent libraries with LTO and then linking those
// together.
if (isDwoUnit() && !DD->shareAcrossDWOCUs())
return false;
return (isa<DIType>(D) ||
(isa<DISubprogram>(D) && !cast<DISubprogram>(D)->isDefinition())) &&
!GenerateDwarfTypeUnits;

5
lib/CodeGen/AsmPrinter/DwarfUnit.h
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@ -65,7 +65,7 @@ public:
//===----------------------------------------------------------------------===//
/// This dwarf writer support class manages information associated with a
/// source file.
class DwarfUnit : public DIEUnit {
class DwarfUnit : public DIEUnit {
protected:
/// MDNode for the compile unit.
const DICompileUnit *CUNode;
@ -103,6 +103,9 @@ protected:
bool applySubprogramDefinitionAttributes(const DISubprogram *SP, DIE &SPDie);
bool shareAcrossDWOCUs() const;
bool isShareableAcrossCUs(const DINode *D) const;
public:
// Accessors.
AsmPrinter* getAsmPrinter() const { return Asm; }

202
test/DebugInfo/X86/split-dwarf-cross-unit-reference.ll
View File

@ -1,46 +1,194 @@
; RUN: llc -mtriple=x86_64-linux -split-dwarf-file=foo.dwo -filetype=obj -o - < %s | llvm-objdump -r - | FileCheck %s
; RUN: llc -mtriple=x86_64-linux -split-dwarf-cross-cu-references -split-dwarf-file=foo.dwo -filetype=obj -o %t < %s
; RUN: llvm-objdump -r %t | FileCheck %s
; RUN: llvm-dwarfdump -debug-dump=info.dwo %t | FileCheck --check-prefix=ALL --check-prefix=INFO --check-prefix=DWO --check-prefix=CROSS %s
; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck --check-prefix=ALL --check-prefix=INFO %s
; RUN: llc -mtriple=x86_64-linux -split-dwarf-file=foo.dwo -filetype=obj -o %t < %s
; RUN: llvm-objdump -r %t | FileCheck %s
; RUN: llvm-dwarfdump -debug-dump=info.dwo %t | FileCheck --check-prefix=ALL --check-prefix=DWO --check-prefix=NOCROSS %s
; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck --check-prefix=ALL --check-prefix=INFO %s
; Testing cross-CU references for types, subprograms, and variables
; Built from code something like this:
; foo.cpp:
; struct t1 { int i; };
; void f();
; __attribute__((always_inline)) void f1(t1 t) {
; f();
; }
; void foo(t1 t) {
; f1(t);
; }
; bar.cpp:
; struct t1 { int i; };
; void f1(t1);
; void bar(t1 t) {
; f1(t);
; }
; $ clang++-tot -emit-llvm -S {foo,bar}.cpp -g
; $ llvm-link-tot {foo,bar}.ll -S -o foobar.ll
; $ clang++-tot -emit-llvm foobar.ll -o foobar.opt.ll -S -c
;
; Then manually removing the original f1 definition, to simplify the DWARF a bit
; (so it only has the inlined definitions, no concrete definition)
; Check that:
; * no relocations are emitted for the debug_info.dwo section no matter what
; * one debug_info->debug_info relocation in debug_info no matter what (for
; split dwarf inlining)
; * debug_info uses relocations and ref_addr no matter what
; * debug_info.dwo uses relocations for types as well as abstract subprograms
; and variables when -split-dwarf-cross-cu-references is used
; * debug_info.dwo contains duplicate types, abstract subprograms and abstract
; variables otherwise to avoid the need for cross-cu references
; CHECK-NOT: .rel{{a?}}.debug_info.dwo
; CHECK: RELOCATION RECORDS FOR [.rel{{a?}}.debug_info]:
; CHECK-NOT: RELOCATION RECORDS
; Expect one relocation in debug_info, between f3 and f1.
; Expect one relocation in debug_info, from the inlined f1 in foo to its
; abstract origin in bar
; CHECK: R_X86_64_32 .debug_info
; CHECK-NOT: RELOCATION RECORDS
; CHECK-NOT: .debug_info
; CHECK: RELOCATION RECORDS
; CHECK-NOT: .rel{{a?}}.debug_info.dwo
; ALL: Compile Unit
; ALL: DW_TAG_compile_unit
; DWO: DW_AT_name {{.*}} "foo.cpp"
; ALL: 0x[[F1:.*]]: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "f1"
; DWO: 0x[[F1T:.*]]: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; DWO: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[T1:.*]]}
; DWO: NULL
; DWO: 0x[[T1]]: DW_TAG_structure_type
; DWO: DW_AT_name {{.*}} "t1"
; ALL: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "foo"
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; DWO: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[T1]]}
; ALL: DW_TAG_inlined_subroutine
; ALL: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[F1]]}
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[F1T]]}
; Function Attrs: noinline nounwind optnone uwtable
define void @_Z2f1v() !dbg !7 {
entry:
ret void, !dbg !10
}
; ALL: Compile Unit
; ALL: DW_TAG_compile_unit
; DWO: DW_AT_name {{.*}} "bar.cpp"
; NOCROSS: 0x[[BAR_F1:.*]]: DW_TAG_subprogram
; NOCROSS: DW_AT_name {{.*}} "f1"
; NOCROSS: 0x[[BAR_F1T:.*]]: DW_TAG_formal_parameter
; NOCROSS: DW_AT_name {{.*}} "t"
; NOCROSS: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[BAR_T1:.*]]}
; NOCROSS: NULL
; NOCROSS: 0x[[BAR_T1]]: DW_TAG_structure_type
; NOCROSS: DW_AT_name {{.*}} "t1"
; ALL: DW_TAG_subprogram
; ALL: DW_AT_name {{.*}} "bar"
; DWO: DW_TAG_formal_parameter
; DWO: DW_AT_name {{.*}} "t"
; CROSS: DW_AT_type [DW_FORM_ref_addr] (0x00000000[[T1]]
; NOCROSS: DW_AT_type [DW_FORM_ref4] {{.*}}{0x[[BAR_T1]]}
; ALL: DW_TAG_inlined_subroutine
; INFO: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x00000000[[F1]]
; NOCROSS: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[BAR_F1]]}
; DWO: DW_TAG_formal_parameter
; CROSS: DW_AT_abstract_origin [DW_FORM_ref_addr] (0x00000000[[F1T]]
; NOCROSS: DW_AT_abstract_origin [DW_FORM_ref4] {{.*}}{0x[[BAR_F1T]]
%struct.t1 = type { i32 }
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_Z1fv() #2
; Function Attrs: noinline uwtable
define void @_Z2f3v() !dbg !13 {
define void @_Z3foo2t1(i32 %t.coerce) #3 !dbg !20 {
entry:
call void @_Z2f1v(), !dbg !14
ret void, !dbg !16
%t.i = alloca %struct.t1, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t.i, metadata !15, metadata !16), !dbg !21
%t = alloca %struct.t1, align 4
%agg.tmp = alloca %struct.t1, align 4
%coerce.dive = getelementptr inbounds %struct.t1, %struct.t1* %t, i32 0, i32 0
store i32 %t.coerce, i32* %coerce.dive, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t, metadata !23, metadata !16), !dbg !24
%0 = bitcast %struct.t1* %agg.tmp to i8*, !dbg !25
%1 = bitcast %struct.t1* %t to i8*, !dbg !25
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 4, i32 4, i1 false), !dbg !25
%coerce.dive1 = getelementptr inbounds %struct.t1, %struct.t1* %agg.tmp, i32 0, i32 0, !dbg !26
%2 = load i32, i32* %coerce.dive1, align 4, !dbg !26
%coerce.dive.i = getelementptr inbounds %struct.t1, %struct.t1* %t.i, i32 0, i32 0
store i32 %2, i32* %coerce.dive.i, align 4
call void @_Z1fv(), !dbg !27
ret void, !dbg !28
}
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i32, i1) #4
; Function Attrs: noinline uwtable
define void @_Z3bar2t1(i32 %t.coerce) #3 !dbg !29 {
entry:
%t.i = alloca %struct.t1, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t.i, metadata !15, metadata !16), !dbg !30
%t = alloca %struct.t1, align 4
%agg.tmp = alloca %struct.t1, align 4
%coerce.dive = getelementptr inbounds %struct.t1, %struct.t1* %t, i32 0, i32 0
store i32 %t.coerce, i32* %coerce.dive, align 4
call void @llvm.dbg.declare(metadata %struct.t1* %t, metadata !32, metadata !16), !dbg !33
%0 = bitcast %struct.t1* %agg.tmp to i8*, !dbg !34
%1 = bitcast %struct.t1* %t to i8*, !dbg !34
call void @llvm.memcpy.p0i8.p0i8.i64(i8* %0, i8* %1, i64 4, i32 4, i1 false), !dbg !34
%coerce.dive1 = getelementptr inbounds %struct.t1, %struct.t1* %agg.tmp, i32 0, i32 0, !dbg !35
%2 = load i32, i32* %coerce.dive1, align 4, !dbg !35
%coerce.dive.i = getelementptr inbounds %struct.t1, %struct.t1* %t.i, i32 0, i32 0
store i32 %2, i32* %coerce.dive.i, align 4
call void @_Z1fv(), !dbg !36
ret void, !dbg !37
}
!llvm.dbg.cu = !{!0, !3}
!llvm.ident = !{!5, !5}
!llvm.module.flags = !{!6}
!llvm.module.flags = !{!6, !7}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 301051) (llvm/trunk 301062)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "a.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: true)
!1 = !DIFile(filename: "foo.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!2 = !{}
!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 5.0.0 (trunk 301051) (llvm/trunk 301062)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!4 = !DIFile(filename: "b.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!5 = !{!"clang version 5.0.0 (trunk 301051) (llvm/trunk 301062)"}
!6 = !{i32 2, !"Debug Info Version", i32 3}
!7 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!8 = !DISubroutineType(types: !9)
!9 = !{null}
!10 = !DILocation(line: 1, scope: !7)
!11 = distinct !DISubprogram(name: "f2", linkageName: "_Z2f2v", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!12 = !DILocation(line: 1, scope: !11)
!13 = distinct !DISubprogram(name: "f3", linkageName: "_Z2f3v", scope: !4, file: !4, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: false, unit: !3, variables: !2)
!14 = !DILocation(line: 1, scope: !11, inlinedAt: !15)
!15 = distinct !DILocation(line: 1, scope: !13)
!16 = !DILocation(line: 1, scope: !13)
!3 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !4, producer: "clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, splitDebugInlining: true)
!4 = !DIFile(filename: "bar.cpp", directory: "/usr/local/google/home/blaikie/dev/scratch")
!5 = !{!"clang version 5.0.0 (trunk 302809) (llvm/trunk 302815)"}
!6 = !{i32 2, !"Dwarf Version", i32 4}
!7 = !{i32 2, !"Debug Info Version", i32 3}
!8 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f12t1", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!9 = !DISubroutineType(types: !10)
!10 = !{null, !11}
!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "t1", file: !1, line: 1, size: 32, elements: !12, identifier: "_ZTS2t1")
!12 = !{!13}
!13 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!15 = !DILocalVariable(name: "t", arg: 1, scope: !8, file: !1, line: 3, type: !11)
!16 = !DIExpression()
!17 = !DILocation(line: 3, column: 43, scope: !8)
!18 = !DILocation(line: 4, column: 3, scope: !8)
!19 = !DILocation(line: 5, column: 1, scope: !8)
!20 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foo2t1", scope: !1, file: !1, line: 6, type: !9, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, variables: !2)
!21 = !DILocation(line: 3, column: 43, scope: !8, inlinedAt: !22)
!22 = distinct !DILocation(line: 7, column: 3, scope: !20)
!23 = !DILocalVariable(name: "t", arg: 1, scope: !20, file: !1, line: 6, type: !11)
!24 = !DILocation(line: 6, column: 13, scope: !20)
!25 = !DILocation(line: 7, column: 6, scope: !20)
!26 = !DILocation(line: 7, column: 3, scope: !20)
!27 = !DILocation(line: 4, column: 3, scope: !8, inlinedAt: !22)
!28 = !DILocation(line: 8, column: 1, scope: !20)
!29 = distinct !DISubprogram(name: "bar", linkageName: "_Z3bar2t1", scope: !4, file: !4, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !3, variables: !2)
!30 = !DILocation(line: 3, column: 43, scope: !8, inlinedAt: !31)
!31 = distinct !DILocation(line: 4, column: 3, scope: !29)
!32 = !DILocalVariable(name: "t", arg: 1, scope: !29, file: !4, line: 3, type: !11)
!33 = !DILocation(line: 3, column: 13, scope: !29)
!34 = !DILocation(line: 4, column: 6, scope: !29)
!35 = !DILocation(line: 4, column: 3, scope: !29)
!36 = !DILocation(line: 4, column: 3, scope: !8, inlinedAt: !31)
!37 = !DILocation(line: 5, column: 1, scope: !29)