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[llvm/DWARF] Recursively resolve DW_AT_signature references #97423

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Jul 18, 2024
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[llvm/DWARF] Recursively resolve DW_AT_signature references #97423

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30c7cef
[llvm/DWARF] Recursively resolve DW_AT_signature references
labath Jul 2, 2024
85daf40
test
labath Jul 17, 2024
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2 changes: 0 additions & 2 deletions llvm/include/llvm/DebugInfo/DWARF/DWARFDie.h
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Original file line number Diff line number Diff line change
Expand Up @@ -181,8 +181,6 @@ class DWARFDie {
DWARFDie getAttributeValueAsReferencedDie(dwarf::Attribute Attr) const;
DWARFDie getAttributeValueAsReferencedDie(const DWARFFormValue &V) const;

DWARFDie resolveTypeUnitReference() const;

/// Extract the range base attribute from this DIE as absolute section offset.
///
/// This is a utility function that checks for either the DW_AT_rnglists_base
Expand Down
36 changes: 12 additions & 24 deletions llvm/lib/DebugInfo/DWARF/DWARFDie.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -103,10 +103,6 @@ static void dumpLocationExpr(raw_ostream &OS, const DWARFFormValue &FormValue,
.print(OS, DumpOpts, U);
}

static DWARFDie resolveReferencedType(DWARFDie D, DWARFFormValue F) {
return D.getAttributeValueAsReferencedDie(F).resolveTypeUnitReference();
}

static void dumpAttribute(raw_ostream &OS, const DWARFDie &Die,
const DWARFAttribute &AttrValue, unsigned Indent,
DIDumpOptions DumpOpts) {
Expand Down Expand Up @@ -198,8 +194,8 @@ static void dumpAttribute(raw_ostream &OS, const DWARFDie &Die,
DINameKind::LinkageName))
OS << Space << "\"" << Name << '\"';
} else if (Attr == DW_AT_type || Attr == DW_AT_containing_type) {
DWARFDie D = resolveReferencedType(Die, FormValue);
if (D && !D.isNULL()) {
if (DWARFDie D = Die.getAttributeValueAsReferencedDie(FormValue);
D && !D.isNULL()) {
OS << Space << "\"";
dumpTypeQualifiedName(D, OS);
OS << '"';
Expand Down Expand Up @@ -291,13 +287,12 @@ DWARFDie::findRecursively(ArrayRef<dwarf::Attribute> Attrs) const {
if (auto Value = Die.find(Attrs))
return Value;

if (auto D = Die.getAttributeValueAsReferencedDie(DW_AT_abstract_origin))
if (Seen.insert(D).second)
Worklist.push_back(D);

if (auto D = Die.getAttributeValueAsReferencedDie(DW_AT_specification))
if (Seen.insert(D).second)
Worklist.push_back(D);
for (dwarf::Attribute Attr :
{DW_AT_abstract_origin, DW_AT_specification, DW_AT_signature}) {
if (auto D = Die.getAttributeValueAsReferencedDie(Attr))
if (Seen.insert(D).second)
Worklist.push_back(D);
}
}

return std::nullopt;
Expand All @@ -319,21 +314,14 @@ DWARFDie::getAttributeValueAsReferencedDie(const DWARFFormValue &V) const {
} else if (Offset = V.getAsDebugInfoReference(); Offset) {
if (DWARFUnit *SpecUnit = U->getUnitVector().getUnitForOffset(*Offset))
Result = SpecUnit->getDIEForOffset(*Offset);
} else if (std::optional<uint64_t> Sig = V.getAsSignatureReference()) {
if (DWARFTypeUnit *TU = U->getContext().getTypeUnitForHash(
U->getVersion(), *Sig, U->isDWOUnit()))
Result = TU->getDIEForOffset(TU->getTypeOffset() + TU->getOffset());
}
return Result;
}

DWARFDie DWARFDie::resolveTypeUnitReference() const {
if (auto Attr = find(DW_AT_signature)) {
if (std::optional<uint64_t> Sig = Attr->getAsReferenceUVal()) {
if (DWARFTypeUnit *TU = U->getContext().getTypeUnitForHash(
U->getVersion(), *Sig, U->isDWOUnit()))
return TU->getDIEForOffset(TU->getTypeOffset() + TU->getOffset());
}
}
return *this;
}

std::optional<uint64_t> DWARFDie::getRangesBaseAttribute() const {
return toSectionOffset(find({DW_AT_rnglists_base, DW_AT_GNU_ranges_base}));
}
Expand Down
52 changes: 25 additions & 27 deletions llvm/lib/DebugInfo/DWARF/DWARFTypePrinter.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -62,17 +62,10 @@ void DWARFTypePrinter::appendArrayType(const DWARFDie &D) {
EndedWithTemplate = false;
}

static DWARFDie resolveReferencedType(DWARFDie D,
dwarf::Attribute Attr = DW_AT_type) {
return D.getAttributeValueAsReferencedDie(Attr).resolveTypeUnitReference();
}
static DWARFDie resolveReferencedType(DWARFDie D, DWARFFormValue F) {
return D.getAttributeValueAsReferencedDie(F).resolveTypeUnitReference();
}
DWARFDie DWARFTypePrinter::skipQualifiers(DWARFDie D) {
while (D && (D.getTag() == DW_TAG_const_type ||
D.getTag() == DW_TAG_volatile_type))
D = resolveReferencedType(D);
D = D.getAttributeValueAsReferencedDie(DW_AT_type);
return D;
}

Expand Down Expand Up @@ -103,7 +96,9 @@ DWARFTypePrinter::appendUnqualifiedNameBefore(DWARFDie D,
return DWARFDie();
}
DWARFDie InnerDIE;
auto Inner = [&] { return InnerDIE = resolveReferencedType(D); };
auto Inner = [&] {
return InnerDIE = D.getAttributeValueAsReferencedDie(DW_AT_type);
};
const dwarf::Tag T = D.getTag();
switch (T) {
case DW_TAG_pointer_type: {
Expand Down Expand Up @@ -134,7 +129,8 @@ DWARFTypePrinter::appendUnqualifiedNameBefore(DWARFDie D,
OS << '(';
else if (Word)
OS << ' ';
if (DWARFDie Cont = resolveReferencedType(D, DW_AT_containing_type)) {
if (DWARFDie Cont =
D.getAttributeValueAsReferencedDie(DW_AT_containing_type)) {
appendQualifiedName(Cont);
EndedWithTemplate = false;
OS << "::";
Expand Down Expand Up @@ -173,7 +169,8 @@ DWARFTypePrinter::appendUnqualifiedNameBefore(DWARFDie D,
case DW_TAG_base_type:
*/
default: {
const char *NamePtr = dwarf::toString(D.find(DW_AT_name), nullptr);
const char *NamePtr =
dwarf::toString(D.findRecursively(DW_AT_name), nullptr);
if (!NamePtr) {
appendTypeTagName(D.getTag());
return DWARFDie();
Expand Down Expand Up @@ -235,9 +232,9 @@ void DWARFTypePrinter::appendUnqualifiedNameAfter(
case DW_TAG_pointer_type: {
if (needsParens(Inner))
OS << ')';
appendUnqualifiedNameAfter(Inner, resolveReferencedType(Inner),
/*SkipFirstParamIfArtificial=*/D.getTag() ==
DW_TAG_ptr_to_member_type);
appendUnqualifiedNameAfter(
Inner, Inner.getAttributeValueAsReferencedDie(DW_AT_type),
/*SkipFirstParamIfArtificial=*/D.getTag() == DW_TAG_ptr_to_member_type);
break;
}
case DW_TAG_LLVM_ptrauth_type: {
Expand Down Expand Up @@ -341,7 +338,7 @@ bool DWARFTypePrinter::appendTemplateParameters(DWARFDie D,
appendTemplateParameters(C, FirstParameter);
}
if (C.getTag() == dwarf::DW_TAG_template_value_parameter) {
DWARFDie T = resolveReferencedType(C);
DWARFDie T = C.getAttributeValueAsReferencedDie(DW_AT_type);
Sep();
if (T.getTag() == DW_TAG_enumeration_type) {
OS << '(';
Expand Down Expand Up @@ -461,7 +458,7 @@ bool DWARFTypePrinter::appendTemplateParameters(DWARFDie D,
continue;
auto TypeAttr = C.find(DW_AT_type);
Sep();
appendQualifiedName(TypeAttr ? resolveReferencedType(C, *TypeAttr)
appendQualifiedName(TypeAttr ? C.getAttributeValueAsReferencedDie(*TypeAttr)
: DWARFDie());
}
if (IsTemplate && *FirstParameter && FirstParameter == &FirstParameterValue) {
Expand All @@ -473,15 +470,15 @@ bool DWARFTypePrinter::appendTemplateParameters(DWARFDie D,
void DWARFTypePrinter::decomposeConstVolatile(DWARFDie &N, DWARFDie &T,
DWARFDie &C, DWARFDie &V) {
(N.getTag() == DW_TAG_const_type ? C : V) = N;
T = resolveReferencedType(N);
T = N.getAttributeValueAsReferencedDie(DW_AT_type);
if (T) {
auto Tag = T.getTag();
if (Tag == DW_TAG_const_type) {
C = T;
T = resolveReferencedType(T);
T = T.getAttributeValueAsReferencedDie(DW_AT_type);
} else if (Tag == DW_TAG_volatile_type) {
V = T;
T = resolveReferencedType(T);
T = T.getAttributeValueAsReferencedDie(DW_AT_type);
}
}
}
Expand All @@ -491,10 +488,11 @@ void DWARFTypePrinter::appendConstVolatileQualifierAfter(DWARFDie N) {
DWARFDie T;
decomposeConstVolatile(N, T, C, V);
if (T && T.getTag() == DW_TAG_subroutine_type)
appendSubroutineNameAfter(T, resolveReferencedType(T), false, C.isValid(),
V.isValid());
appendSubroutineNameAfter(T, T.getAttributeValueAsReferencedDie(DW_AT_type),
false, C.isValid(), V.isValid());
else
appendUnqualifiedNameAfter(T, resolveReferencedType(T));
appendUnqualifiedNameAfter(T,
T.getAttributeValueAsReferencedDie(DW_AT_type));
}
void DWARFTypePrinter::appendConstVolatileQualifierBefore(DWARFDie N) {
DWARFDie C;
Expand All @@ -504,7 +502,7 @@ void DWARFTypePrinter::appendConstVolatileQualifierBefore(DWARFDie N) {
bool Subroutine = T && T.getTag() == DW_TAG_subroutine_type;
DWARFDie A = T;
while (A && A.getTag() == DW_TAG_array_type)
A = resolveReferencedType(A);
A = A.getAttributeValueAsReferencedDie(DW_AT_type);
bool Leading =
(!A || (A.getTag() != DW_TAG_pointer_type &&
A.getTag() != llvm::dwarf::DW_TAG_ptr_to_member_type)) &&
Expand Down Expand Up @@ -546,7 +544,7 @@ void DWARFTypePrinter::appendSubroutineNameAfter(
if (P.getTag() != DW_TAG_formal_parameter &&
P.getTag() != DW_TAG_unspecified_parameters)
return;
DWARFDie T = resolveReferencedType(P);
DWARFDie T = P.getAttributeValueAsReferencedDie(DW_AT_type);
if (SkipFirstParamIfArtificial && RealFirst && P.find(DW_AT_artificial)) {
FirstParamIfArtificial = T;
RealFirst = false;
Expand All @@ -567,7 +565,7 @@ void DWARFTypePrinter::appendSubroutineNameAfter(
if (DWARFDie P = FirstParamIfArtificial) {
if (P.getTag() == DW_TAG_pointer_type) {
auto CVStep = [&](DWARFDie CV) {
if (DWARFDie U = resolveReferencedType(CV)) {
if (DWARFDie U = CV.getAttributeValueAsReferencedDie(DW_AT_type)) {
Const |= U.getTag() == DW_TAG_const_type;
Volatile |= U.getTag() == DW_TAG_volatile_type;
return U;
Expand Down Expand Up @@ -653,7 +651,8 @@ void DWARFTypePrinter::appendSubroutineNameAfter(
if (D.find(DW_AT_rvalue_reference))
OS << " &&";

appendUnqualifiedNameAfter(Inner, resolveReferencedType(Inner));
appendUnqualifiedNameAfter(
Inner, Inner.getAttributeValueAsReferencedDie(DW_AT_type));
}
void DWARFTypePrinter::appendScopes(DWARFDie D) {
if (D.getTag() == DW_TAG_compile_unit)
Expand All @@ -666,7 +665,6 @@ void DWARFTypePrinter::appendScopes(DWARFDie D) {
return;
if (D.getTag() == DW_TAG_lexical_block)
return;
D = D.resolveTypeUnitReference();
if (DWARFDie P = D.getParent())
appendScopes(P);
appendUnqualifiedName(D);
Expand Down
19 changes: 17 additions & 2 deletions llvm/test/tools/llvm-dwarfdump/X86/prettyprint_type_units.s
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Original file line number Diff line number Diff line change
Expand Up @@ -18,12 +18,15 @@
# doesn't really need templates - two local variables would've sufficed
# (anything that references the type units) but I was working on something else
# and this seemed minimal enough.
# A gcc-style type signature reference was also inserted.


# CHECK: DW_TAG_template_type_parameter
# CHECK: DW_AT_type ({{.*}} "t1")
# CHECK: DW_TAG_template_type_parameter
# CHECK: DW_AT_type ({{.*}} "t2")
# CHECK: DW_TAG_template_type_parameter
# CHECK: DW_AT_type (0xc6694e51369161f2 "t1")

.text
.file "test.cpp"
Expand Down Expand Up @@ -270,6 +273,13 @@ _Z2f1IJ2t12t2EEvv: # @_Z2f1IJ2t12t2EEvv
.byte 11 # DW_FORM_data1
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 12 # Abbreviation Code
.byte 47 # DW_TAG_template_type_parameter
.byte 0 # DW_CHILDREN_no
.byte 73 # DW_AT_type
.byte 32 # DW_FORM_ref_sig8
.byte 0 # EOM(1)
.byte 0 # EOM(2)
.byte 0 # EOM(3)
.section .debug_info,"",@progbits
.Lcu_begin0:
Expand Down Expand Up @@ -313,18 +323,23 @@ _Z2f1IJ2t12t2EEvv: # @_Z2f1IJ2t12t2EEvv
.byte 6 # Abbrev [6] 0x46:0xd DW_TAG_GNU_template_parameter_pack
.byte 5 # DW_AT_name
.byte 7 # Abbrev [7] 0x48:0x5 DW_TAG_template_type_parameter
.long 88 # DW_AT_type
.long .Lt1_decl-.Lcu_begin0 # DW_AT_type
.byte 7 # Abbrev [7] 0x4d:0x5 DW_TAG_template_type_parameter
.long 97 # DW_AT_type
# Simulate DWARF emitted by GCC where the signature is directly in the type attribute.
.long .Lt2_decl-.Lcu_begin0 # DW_AT_type
.byte 12 # Abbrev [12] DW_TAG_template_type_parameter
.quad -4149699470930386446 # DW_AT_type
.byte 0 # End Of Children Mark
.byte 0 # End Of Children Mark
.byte 8 # Abbrev [8] 0x54:0x4 DW_TAG_base_type
.byte 4 # DW_AT_name
.byte 5 # DW_AT_encoding
.byte 4 # DW_AT_byte_size
.Lt1_decl:
.byte 9 # Abbrev [9] 0x58:0x9 DW_TAG_structure_type
# DW_AT_declaration
.quad -4149699470930386446 # DW_AT_signature
.Lt2_decl:
.byte 9 # Abbrev [9] 0x61:0x9 DW_TAG_structure_type
# DW_AT_declaration
.quad 5649318945901130368 # DW_AT_signature
Expand Down
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