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IR: getOrInsertODRUniquedType => DICompositeType::getODRType, NFC

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Lift the API for debug info ODR type uniquing up a layer.  Instead of
clients managing the map directly on the LLVMContext, add a static
method to DICompositeType called getODRType and handle the map in the
background.  Also adds DICompositeType::getODRTypeIfExists, so far just
for convenience in the unit tests.

This simplifies the logic in LLParser and BitcodeReader.  Because of
argument spam there are actually a few more lines of code now; I'll see
if I come up with a reasonable way to clean that up.

llvm-svn: 266742
This commit is contained in:
Duncan P. N. Exon Smith 2016-04-19 14:55:09 +00:00
parent 74624754a7
commit e6893b5521
8 changed files with 103 additions and 60 deletions
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17
include/llvm/IR/DebugInfoMetadata.h
View File

@ -825,6 +825,23 @@ public:
TempDICompositeType clone() const { return cloneImpl(); }
/// Get a DICompositeType with the given ODR identifier.
///
/// If \a LLVMContext::isODRUniquingDebugTypes(), gets the mapped
/// DICompositeType for the given ODR \c Identifier. If none exists, creates
/// a new node.
///
/// Else, returns \c nullptr.
static DICompositeType *
getODRType(LLVMContext &Context, MDString &Identifier, unsigned Tag,
MDString *Name, Metadata *File, unsigned Line, Metadata *Scope,
Metadata *BaseType, uint64_t SizeInBits, uint64_t AlignInBits,
uint64_t OffsetInBits, unsigned Flags, Metadata *Elements,
unsigned RuntimeLang, Metadata *VTableHolder,
Metadata *TemplateParams);
static DICompositeType *getODRTypeIfExists(LLVMContext &Context,
MDString &Identifier);
DITypeRef getBaseType() const { return DITypeRef(getRawBaseType()); }
DINodeArray getElements() const {
return cast_or_null<MDTuple>(getRawElements());

11
include/llvm/IR/LLVMContext.h
View File

@ -121,17 +121,6 @@ public:
void enableDebugTypeODRUniquing();
void disableDebugTypeODRUniquing();
/// Get or insert the DICompositeType mapped to the given string.
///
/// Returns the address of the current \a DICompositeType pointer mapped to
/// \c S, inserting a mapping to \c nullptr if \c S was not previously
/// mapped. This method has no effect (and returns \c nullptr instead of a
/// valid address) if \a isODRUniquingDebugTypes() is \c false.
///
/// \post If \a isODRUniquingDebugTypes(), \c S will have a (possibly null)
/// mapping. \note The returned address is only valid until the next call.
DICompositeType **getOrInsertODRUniquedType(const MDString &S);
typedef void (*InlineAsmDiagHandlerTy)(const SMDiagnostic&, void *Context,
unsigned LocCookie);

18
lib/AsmParser/LLParser.cpp
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@ -3841,13 +3841,15 @@ bool LLParser::ParseDICompositeType(MDNode *&Result, bool IsDistinct) {
// If this isn't a forward declaration and it has a UUID, check for it in the
// type map in the context.
DICompositeType **MappedT = nullptr;
if (!(flags.Val & DINode::FlagFwdDecl) && identifier.Val &&
(MappedT = Context.getOrInsertODRUniquedType(*identifier.Val)) &&
*MappedT) {
Result = *MappedT;
return false;
}
if (!(flags.Val & DINode::FlagFwdDecl) && identifier.Val)
if (auto *CT = DICompositeType::getODRType(
Context, *identifier.Val, tag.Val, name.Val, file.Val, line.Val,
scope.Val, baseType.Val, size.Val, align.Val, offset.Val, flags.Val,
elements.Val, runtimeLang.Val, vtableHolder.Val,
templateParams.Val)) {
Result = CT;
return false;
}
// Create a new node, and save it in the context if it belongs in the type
// map.
@ -3856,8 +3858,6 @@ bool LLParser::ParseDICompositeType(MDNode *&Result, bool IsDistinct) {
(Context, tag.Val, name.Val, file.Val, line.Val, scope.Val, baseType.Val,
size.Val, align.Val, offset.Val, flags.Val, elements.Val,
runtimeLang.Val, vtableHolder.Val, templateParams.Val, identifier.Val));
if (MappedT)
*MappedT = cast<DICompositeType>(Result);
return false;
}

41
lib/Bitcode/Reader/BitcodeReader.cpp
View File

@ -2190,25 +2190,36 @@ std::error_code BitcodeReader::parseMetadata(bool ModuleLevel) {
// If we have a UUID and this is not a forward declaration, lookup the
// mapping.
bool IsDistinct = Record[0];
unsigned Tag = Record[1];
MDString *Name = getMDString(Record[2]);
Metadata *File = getMDOrNull(Record[3]);
unsigned Line = Record[4];
Metadata *Scope = getMDOrNull(Record[5]);
Metadata *BaseType = getMDOrNull(Record[6]);
uint64_t SizeInBits = Record[7];
uint64_t AlignInBits = Record[8];
uint64_t OffsetInBits = Record[9];
unsigned Flags = Record[10];
Metadata *Elements = getMDOrNull(Record[11]);
unsigned RuntimeLang = Record[12];
Metadata *VTableHolder = getMDOrNull(Record[13]);
Metadata *TemplateParams = getMDOrNull(Record[14]);
auto *Identifier = getMDString(Record[15]);
DICompositeType **MappedT = nullptr;
DICompositeType *CT = nullptr;
if (!(Flags & DINode::FlagFwdDecl) && Identifier)
MappedT = Context.getOrInsertODRUniquedType(*Identifier);
CT = DICompositeType::getODRType(
Context, *Identifier, Tag, Name, File, Line, Scope, BaseType,
SizeInBits, AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
VTableHolder, TemplateParams);
// Use the mapped type node, or create a new one if necessary.
DICompositeType *CT = MappedT ? *MappedT : nullptr;
if (!CT) {
CT = GET_OR_DISTINCT(
DICompositeType, Record[0],
(Context, Record[1], getMDString(Record[2]), getMDOrNull(Record[3]),
Record[4], getMDOrNull(Record[5]), getMDOrNull(Record[6]),
Record[7], Record[8], Record[9], Flags, getMDOrNull(Record[11]),
Record[12], getMDOrNull(Record[13]), getMDOrNull(Record[14]),
Identifier));
if (MappedT)
*MappedT = CT;
}
// Create a node if we didn't get a lazy ODR type.
if (!CT)
CT = GET_OR_DISTINCT(DICompositeType, IsDistinct,
(Context, Tag, Name, File, Line, Scope, BaseType,
SizeInBits, AlignInBits, OffsetInBits, Flags,
Elements, RuntimeLang, VTableHolder,
TemplateParams, Identifier));
MetadataList.assignValue(CT, NextMetadataNo++);
break;

26
lib/IR/DebugInfoMetadata.cpp
View File

@ -266,6 +266,32 @@ DICompositeType *DICompositeType::getImpl(
Ops);
}
DICompositeType *DICompositeType::getODRType(
LLVMContext &Context, MDString &Identifier, unsigned Tag, MDString *Name,
Metadata *File, unsigned Line, Metadata *Scope, Metadata *BaseType,
uint64_t SizeInBits, uint64_t AlignInBits, uint64_t OffsetInBits,
unsigned Flags, Metadata *Elements, unsigned RuntimeLang,
Metadata *VTableHolder, Metadata *TemplateParams) {
assert(!Identifier.getString().empty() && "Expected valid identifier");
if (!Context.isODRUniquingDebugTypes())
return nullptr;
auto *&CT = (*Context.pImpl->DITypeMap)[&Identifier];
if (!CT)
CT = DICompositeType::getDistinct(
Context, Tag, Name, File, Line, Scope, BaseType, SizeInBits,
AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang, VTableHolder,
TemplateParams, &Identifier);
return CT;
}
DICompositeType *DICompositeType::getODRTypeIfExists(LLVMContext &Context,
MDString &Identifier) {
assert(!Identifier.getString().empty() && "Expected valid identifier");
if (!Context.isODRUniquingDebugTypes())
return nullptr;
return Context.pImpl->DITypeMap->lookup(&Identifier);
}
DISubroutineType *DISubroutineType::getImpl(LLVMContext &Context,
unsigned Flags, Metadata *TypeArray,
StorageType Storage,

6
lib/IR/LLVMContext.cpp
View File

@ -323,12 +323,6 @@ void LLVMContext::enableDebugTypeODRUniquing() {
void LLVMContext::disableDebugTypeODRUniquing() { pImpl->DITypeMap.reset(); }
DICompositeType **LLVMContext::getOrInsertODRUniquedType(const MDString &S) {
if (!isODRUniquingDebugTypes())
return nullptr;
return &(*pImpl->DITypeMap)[&S];
}
void LLVMContext::setDiscardValueNames(bool Discard) {
pImpl->DiscardValueNames = Discard;
}

4
test/Linker/dicompositetype-unique.ll
View File

@ -21,11 +21,11 @@
!named = !{!0, !1}
; Check both directions.
; CHECK: !1 = !DICompositeType(
; CHECK: !1 = distinct !DICompositeType(
; CHECK-SAME: name: "T1"
; CHECK-SAME: identifier: "T"
; CHECK-NOT: identifier: "T"
; REVERSE: !1 = !DICompositeType(
; REVERSE: !1 = distinct !DICompositeType(
; REVERSE-SAME: name: "T2"
; REVERSE-SAME: identifier: "T"
; REVERSE-NOT: identifier: "T"

40
unittests/IR/LLVMContextTest.cpp
View File

@ -25,35 +25,41 @@ TEST(LLVMContextTest, enableDebugTypeODRUniquing) {
TEST(LLVMContextTest, getOrInsertODRUniquedType) {
LLVMContext Context;
const MDString &S = *MDString::get(Context, "string");
MDString &UUID = *MDString::get(Context, "string");
// Without a type map, this should return null.
EXPECT_FALSE(Context.getOrInsertODRUniquedType(S));
EXPECT_FALSE(DICompositeType::getODRType(
Context, UUID, dwarf::DW_TAG_class_type, nullptr, nullptr, 0, nullptr,
nullptr, 0, 0, 0, 0, nullptr, 0, nullptr, nullptr));
// Get the mapping.
// Enable the mapping. There still shouldn't be a type.
Context.enableDebugTypeODRUniquing();
DICompositeType **Mapping = Context.getOrInsertODRUniquedType(S);
ASSERT_TRUE(Mapping);
EXPECT_FALSE(DICompositeType::getODRTypeIfExists(Context, UUID));
// Create some type and add it to the mapping.
auto &CT = *DICompositeType::get(Context, dwarf::DW_TAG_class_type, "name",
nullptr, 0, nullptr, nullptr, 0, 0, 0, 0,
nullptr, 0, nullptr, nullptr, S.getString());
ASSERT_EQ(S.getString(), CT.getIdentifier());
*Mapping = &CT;
// Create some ODR-uniqued type.
auto &CT = *DICompositeType::getODRType(
Context, UUID, dwarf::DW_TAG_class_type, nullptr, nullptr, 0, nullptr,
nullptr, 0, 0, 0, 0, nullptr, 0, nullptr, nullptr);
EXPECT_EQ(UUID.getString(), CT.getIdentifier());
// Check that we get it back.
Mapping = Context.getOrInsertODRUniquedType(S);
ASSERT_TRUE(Mapping);
EXPECT_EQ(&CT, *Mapping);
// Check that we get it back, even if we change a field.
EXPECT_EQ(&CT, DICompositeType::getODRTypeIfExists(Context, UUID));
EXPECT_EQ(
&CT, DICompositeType::getODRType(Context, UUID, dwarf::DW_TAG_class_type,
nullptr, nullptr, 0, nullptr, nullptr, 0,
0, 0, 0, nullptr, 0, nullptr, nullptr));
EXPECT_EQ(&CT, DICompositeType::getODRType(
Context, UUID, dwarf::DW_TAG_class_type,
MDString::get(Context, "name"), nullptr, 0, nullptr,
nullptr, 0, 0, 0, 0, nullptr, 0, nullptr, nullptr));
// Check that it's discarded with the type map.
Context.disableDebugTypeODRUniquing();
EXPECT_FALSE(Context.getOrInsertODRUniquedType(S));
EXPECT_FALSE(DICompositeType::getODRTypeIfExists(Context, UUID));
// And it shouldn't magically reappear...
Context.enableDebugTypeODRUniquing();
EXPECT_FALSE(*Context.getOrInsertODRUniquedType(S));
EXPECT_FALSE(DICompositeType::getODRTypeIfExists(Context, UUID));
}
} // end namespace