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llvm-mirror/lib/IR/DebugInfoMetadata.cpp
Sourabh Singh Tomar 9241b8151b [DebugInfo][flang]Added support for representing Fortran assumed length strings 
This patch adds support for representing Fortran `character(n)`.

Primarily patch is based out of D54114 with appropriate modifications.

Test case IR is generated using our downstream classic-flang. We're in process
of upstreaming flang PR's but classic-flang has dependencies on llvm, so
this has to get in first.

Patch includes functional test case for both IR and corresponding
dwarf, furthermore it has been manually tested as well using GDB.

Source snippet:
```
 program assumedLength
   call sub('Hello')
   call sub('Goodbye')
   contains
   subroutine sub(string)
           implicit none
           character(len=*), intent(in) :: string
           print *, string
   end subroutine sub
 end program assumedLength
```

GDB:
```
(gdb) ptype string
type = character (5)
(gdb) p string
$1 = 'Hello'
```

Reviewed By: aprantl, schweitz

Differential Revision: https://reviews.llvm.org/D86305
2020-08-22 10:13:40 +05:30

1398 lines
54 KiB
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//===- DebugInfoMetadata.cpp - Implement debug info metadata --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the debug info Metadata classes.
//
//===----------------------------------------------------------------------===//
#include "llvm/IR/DebugInfoMetadata.h"
#include "LLVMContextImpl.h"
#include "MetadataImpl.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/StringSwitch.h"
#include "llvm/IR/DIBuilder.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/Instructions.h"
#include <numeric>
using namespace llvm;
const DIExpression::FragmentInfo DebugVariable::DefaultFragment = {
std::numeric_limits<uint64_t>::max(), std::numeric_limits<uint64_t>::min()};
DILocation::DILocation(LLVMContext &C, StorageType Storage, unsigned Line,
unsigned Column, ArrayRef<Metadata *> MDs,
bool ImplicitCode)
: MDNode(C, DILocationKind, Storage, MDs) {
assert((MDs.size() == 1 || MDs.size() == 2) &&
"Expected a scope and optional inlined-at");
// Set line and column.
assert(Column < (1u << 16) && "Expected 16-bit column");
SubclassData32 = Line;
SubclassData16 = Column;
setImplicitCode(ImplicitCode);
}
static void adjustColumn(unsigned &Column) {
// Set to unknown on overflow. We only have 16 bits to play with here.
if (Column >= (1u << 16))
Column = 0;
}
DILocation *DILocation::getImpl(LLVMContext &Context, unsigned Line,
unsigned Column, Metadata *Scope,
Metadata *InlinedAt, bool ImplicitCode,
StorageType Storage, bool ShouldCreate) {
// Fixup column.
adjustColumn(Column);
if (Storage == Uniqued) {
if (auto *N = getUniqued(Context.pImpl->DILocations,
DILocationInfo::KeyTy(Line, Column, Scope,
InlinedAt, ImplicitCode)))
return N;
if (!ShouldCreate)
return nullptr;
} else {
assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
}
SmallVector<Metadata *, 2> Ops;
Ops.push_back(Scope);
if (InlinedAt)
Ops.push_back(InlinedAt);
return storeImpl(new (Ops.size()) DILocation(Context, Storage, Line, Column,
Ops, ImplicitCode),
Storage, Context.pImpl->DILocations);
}
const
DILocation *DILocation::getMergedLocations(ArrayRef<const DILocation *> Locs) {
if (Locs.empty())
return nullptr;
if (Locs.size() == 1)
return Locs[0];
auto *Merged = Locs[0];
for (auto I = std::next(Locs.begin()), E = Locs.end(); I != E; ++I) {
Merged = getMergedLocation(Merged, *I);
if (Merged == nullptr)
break;
}
return Merged;
}
const DILocation *DILocation::getMergedLocation(const DILocation *LocA,
const DILocation *LocB) {
if (!LocA || !LocB)
return nullptr;
if (LocA == LocB)
return LocA;
SmallPtrSet<DILocation *, 5> InlinedLocationsA;
for (DILocation *L = LocA->getInlinedAt(); L; L = L->getInlinedAt())
InlinedLocationsA.insert(L);
SmallSet<std::pair<DIScope *, DILocation *>, 5> Locations;
DIScope *S = LocA->getScope();
DILocation *L = LocA->getInlinedAt();
while (S) {
Locations.insert(std::make_pair(S, L));
S = S->getScope();
if (!S && L) {
S = L->getScope();
L = L->getInlinedAt();
}
}
const DILocation *Result = LocB;
S = LocB->getScope();
L = LocB->getInlinedAt();
while (S) {
if (Locations.count(std::make_pair(S, L)))
break;
S = S->getScope();
if (!S && L) {
S = L->getScope();
L = L->getInlinedAt();
}
}
// If the two locations are irreconsilable, just pick one. This is misleading,
// but on the other hand, it's a "line 0" location.
if (!S || !isa<DILocalScope>(S))
S = LocA->getScope();
return DILocation::get(Result->getContext(), 0, 0, S, L);
}
Optional<unsigned> DILocation::encodeDiscriminator(unsigned BD, unsigned DF, unsigned CI) {
SmallVector<unsigned, 3> Components = {BD, DF, CI};
uint64_t RemainingWork = 0U;
// We use RemainingWork to figure out if we have no remaining components to
// encode. For example: if BD != 0 but DF == 0 && CI == 0, we don't need to
// encode anything for the latter 2.
// Since any of the input components is at most 32 bits, their sum will be
// less than 34 bits, and thus RemainingWork won't overflow.
RemainingWork = std::accumulate(Components.begin(), Components.end(), RemainingWork);
int I = 0;
unsigned Ret = 0;
unsigned NextBitInsertionIndex = 0;
while (RemainingWork > 0) {
unsigned C = Components[I++];
RemainingWork -= C;
unsigned EC = encodeComponent(C);
Ret |= (EC << NextBitInsertionIndex);
NextBitInsertionIndex += encodingBits(C);
}
// Encoding may be unsuccessful because of overflow. We determine success by
// checking equivalence of components before & after encoding. Alternatively,
// we could determine Success during encoding, but the current alternative is
// simpler.
unsigned TBD, TDF, TCI = 0;
decodeDiscriminator(Ret, TBD, TDF, TCI);
if (TBD == BD && TDF == DF && TCI == CI)
return Ret;
return None;
}
void DILocation::decodeDiscriminator(unsigned D, unsigned &BD, unsigned &DF,
unsigned &CI) {
BD = getUnsignedFromPrefixEncoding(D);
DF = getUnsignedFromPrefixEncoding(getNextComponentInDiscriminator(D));
CI = getUnsignedFromPrefixEncoding(
getNextComponentInDiscriminator(getNextComponentInDiscriminator(D)));
}
DINode::DIFlags DINode::getFlag(StringRef Flag) {
return StringSwitch<DIFlags>(Flag)
#define HANDLE_DI_FLAG(ID, NAME) .Case("DIFlag" #NAME, Flag##NAME)
#include "llvm/IR/DebugInfoFlags.def"
.Default(DINode::FlagZero);
}
StringRef DINode::getFlagString(DIFlags Flag) {
switch (Flag) {
#define HANDLE_DI_FLAG(ID, NAME) \
case Flag##NAME: \
return "DIFlag" #NAME;
#include "llvm/IR/DebugInfoFlags.def"
}
return "";
}
DINode::DIFlags DINode::splitFlags(DIFlags Flags,
SmallVectorImpl<DIFlags> &SplitFlags) {
// Flags that are packed together need to be specially handled, so
// that, for example, we emit "DIFlagPublic" and not
// "DIFlagPrivate | DIFlagProtected".
if (DIFlags A = Flags & FlagAccessibility) {
if (A == FlagPrivate)
SplitFlags.push_back(FlagPrivate);
else if (A == FlagProtected)
SplitFlags.push_back(FlagProtected);
else
SplitFlags.push_back(FlagPublic);
Flags &= ~A;
}
if (DIFlags R = Flags & FlagPtrToMemberRep) {
if (R == FlagSingleInheritance)
SplitFlags.push_back(FlagSingleInheritance);
else if (R == FlagMultipleInheritance)
SplitFlags.push_back(FlagMultipleInheritance);
else
SplitFlags.push_back(FlagVirtualInheritance);
Flags &= ~R;
}
if ((Flags & FlagIndirectVirtualBase) == FlagIndirectVirtualBase) {
Flags &= ~FlagIndirectVirtualBase;
SplitFlags.push_back(FlagIndirectVirtualBase);
}
#define HANDLE_DI_FLAG(ID, NAME) \
if (DIFlags Bit = Flags & Flag##NAME) { \
SplitFlags.push_back(Bit); \
Flags &= ~Bit; \
}
#include "llvm/IR/DebugInfoFlags.def"
return Flags;
}
DIScope *DIScope::getScope() const {
if (auto *T = dyn_cast<DIType>(this))
return T->getScope();
if (auto *SP = dyn_cast<DISubprogram>(this))
return SP->getScope();
if (auto *LB = dyn_cast<DILexicalBlockBase>(this))
return LB->getScope();
if (auto *NS = dyn_cast<DINamespace>(this))
return NS->getScope();
if (auto *CB = dyn_cast<DICommonBlock>(this))
return CB->getScope();
if (auto *M = dyn_cast<DIModule>(this))
return M->getScope();
assert((isa<DIFile>(this) || isa<DICompileUnit>(this)) &&
"Unhandled type of scope.");
return nullptr;
}
StringRef DIScope::getName() const {
if (auto *T = dyn_cast<DIType>(this))
return T->getName();
if (auto *SP = dyn_cast<DISubprogram>(this))
return SP->getName();
if (auto *NS = dyn_cast<DINamespace>(this))
return NS->getName();
if (auto *CB = dyn_cast<DICommonBlock>(this))
return CB->getName();
if (auto *M = dyn_cast<DIModule>(this))
return M->getName();
assert((isa<DILexicalBlockBase>(this) || isa<DIFile>(this) ||
isa<DICompileUnit>(this)) &&
"Unhandled type of scope.");
return "";
}
#ifndef NDEBUG
static bool isCanonical(const MDString *S) {
return !S || !S->getString().empty();
}
#endif
GenericDINode *GenericDINode::getImpl(LLVMContext &Context, unsigned Tag,
MDString *Header,
ArrayRef<Metadata *> DwarfOps,
StorageType Storage, bool ShouldCreate) {
unsigned Hash = 0;
if (Storage == Uniqued) {
GenericDINodeInfo::KeyTy Key(Tag, Header, DwarfOps);
if (auto *N = getUniqued(Context.pImpl->GenericDINodes, Key))
return N;
if (!ShouldCreate)
return nullptr;
Hash = Key.getHash();
} else {
assert(ShouldCreate && "Expected non-uniqued nodes to always be created");
}
// Use a nullptr for empty headers.
assert(isCanonical(Header) && "Expected canonical MDString");
Metadata *PreOps[] = {Header};
return storeImpl(new (DwarfOps.size() + 1) GenericDINode(
Context, Storage, Hash, Tag, PreOps, DwarfOps),
Storage, Context.pImpl->GenericDINodes);
}
void GenericDINode::recalculateHash() {
setHash(GenericDINodeInfo::KeyTy::calculateHash(this));
}
#define UNWRAP_ARGS_IMPL(...) __VA_ARGS__
#define UNWRAP_ARGS(ARGS) UNWRAP_ARGS_IMPL ARGS
#define DEFINE_GETIMPL_LOOKUP(CLASS, ARGS) \
do { \
if (Storage == Uniqued) { \
if (auto *N = getUniqued(Context.pImpl->CLASS##s, \
CLASS##Info::KeyTy(UNWRAP_ARGS(ARGS)))) \
return N; \
if (!ShouldCreate) \
return nullptr; \
} else { \
assert(ShouldCreate && \
"Expected non-uniqued nodes to always be created"); \
} \
} while (false)
#define DEFINE_GETIMPL_STORE(CLASS, ARGS, OPS) \
return storeImpl(new (array_lengthof(OPS)) \
CLASS(Context, Storage, UNWRAP_ARGS(ARGS), OPS), \
Storage, Context.pImpl->CLASS##s)
#define DEFINE_GETIMPL_STORE_NO_OPS(CLASS, ARGS) \
return storeImpl(new (0u) CLASS(Context, Storage, UNWRAP_ARGS(ARGS)), \
Storage, Context.pImpl->CLASS##s)
#define DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(CLASS, OPS) \
return storeImpl(new (array_lengthof(OPS)) CLASS(Context, Storage, OPS), \
Storage, Context.pImpl->CLASS##s)
#define DEFINE_GETIMPL_STORE_N(CLASS, ARGS, OPS, NUM_OPS) \
return storeImpl(new (NUM_OPS) \
CLASS(Context, Storage, UNWRAP_ARGS(ARGS), OPS), \
Storage, Context.pImpl->CLASS##s)
DISubrange *DISubrange::getImpl(LLVMContext &Context, int64_t Count, int64_t Lo,
StorageType Storage, bool ShouldCreate) {
auto *CountNode = ConstantAsMetadata::get(
ConstantInt::getSigned(Type::getInt64Ty(Context), Count));
auto *LB = ConstantAsMetadata::get(
ConstantInt::getSigned(Type::getInt64Ty(Context), Lo));
return getImpl(Context, CountNode, LB, nullptr, nullptr, Storage,
ShouldCreate);
}
DISubrange *DISubrange::getImpl(LLVMContext &Context, Metadata *CountNode,
int64_t Lo, StorageType Storage,
bool ShouldCreate) {
auto *LB = ConstantAsMetadata::get(
ConstantInt::getSigned(Type::getInt64Ty(Context), Lo));
return getImpl(Context, CountNode, LB, nullptr, nullptr, Storage,
ShouldCreate);
}
DISubrange *DISubrange::getImpl(LLVMContext &Context, Metadata *CountNode,
Metadata *LB, Metadata *UB, Metadata *Stride,
StorageType Storage, bool ShouldCreate) {
DEFINE_GETIMPL_LOOKUP(DISubrange, (CountNode, LB, UB, Stride));
Metadata *Ops[] = {CountNode, LB, UB, Stride};
DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DISubrange, Ops);
}
DISubrange::CountType DISubrange::getCount() const {
if (!getRawCountNode())
return CountType();
if (auto *MD = dyn_cast<ConstantAsMetadata>(getRawCountNode()))
return CountType(cast<ConstantInt>(MD->getValue()));
if (auto *DV = dyn_cast<DIVariable>(getRawCountNode()))
return CountType(DV);
return CountType();
}
DISubrange::BoundType DISubrange::getLowerBound() const {
Metadata *LB = getRawLowerBound();
if (!LB)
return BoundType();
assert((isa<ConstantAsMetadata>(LB) || isa<DIVariable>(LB) ||
isa<DIExpression>(LB)) &&
"LowerBound must be signed constant or DIVariable or DIExpression");
if (auto *MD = dyn_cast<ConstantAsMetadata>(LB))
return BoundType(cast<ConstantInt>(MD->getValue()));
if (auto *MD = dyn_cast<DIVariable>(LB))
return BoundType(MD);
if (auto *MD = dyn_cast<DIExpression>(LB))
return BoundType(MD);
return BoundType();
}
DISubrange::BoundType DISubrange::getUpperBound() const {
Metadata *UB = getRawUpperBound();
if (!UB)
return BoundType();
assert((isa<ConstantAsMetadata>(UB) || isa<DIVariable>(UB) ||
isa<DIExpression>(UB)) &&
"UpperBound must be signed constant or DIVariable or DIExpression");
if (auto *MD = dyn_cast<ConstantAsMetadata>(UB))
return BoundType(cast<ConstantInt>(MD->getValue()));
if (auto *MD = dyn_cast<DIVariable>(UB))
return BoundType(MD);
if (auto *MD = dyn_cast<DIExpression>(UB))
return BoundType(MD);
return BoundType();
}
DISubrange::BoundType DISubrange::getStride() const {
Metadata *ST = getRawStride();
if (!ST)
return BoundType();
assert((isa<ConstantAsMetadata>(ST) || isa<DIVariable>(ST) ||
isa<DIExpression>(ST)) &&
"Stride must be signed constant or DIVariable or DIExpression");
if (auto *MD = dyn_cast<ConstantAsMetadata>(ST))
return BoundType(cast<ConstantInt>(MD->getValue()));
if (auto *MD = dyn_cast<DIVariable>(ST))
return BoundType(MD);
if (auto *MD = dyn_cast<DIExpression>(ST))
return BoundType(MD);
return BoundType();
}
DIEnumerator *DIEnumerator::getImpl(LLVMContext &Context, const APInt &Value,
bool IsUnsigned, MDString *Name,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIEnumerator, (Value, IsUnsigned, Name));
Metadata *Ops[] = {Name};
DEFINE_GETIMPL_STORE(DIEnumerator, (Value, IsUnsigned), Ops);
}
DIBasicType *DIBasicType::getImpl(LLVMContext &Context, unsigned Tag,
MDString *Name, uint64_t SizeInBits,
uint32_t AlignInBits, unsigned Encoding,
DIFlags Flags, StorageType Storage,
bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIBasicType,
(Tag, Name, SizeInBits, AlignInBits, Encoding, Flags));
Metadata *Ops[] = {nullptr, nullptr, Name};
DEFINE_GETIMPL_STORE(DIBasicType, (Tag, SizeInBits, AlignInBits, Encoding,
Flags), Ops);
}
Optional<DIBasicType::Signedness> DIBasicType::getSignedness() const {
switch (getEncoding()) {
case dwarf::DW_ATE_signed:
case dwarf::DW_ATE_signed_char:
return Signedness::Signed;
case dwarf::DW_ATE_unsigned:
case dwarf::DW_ATE_unsigned_char:
return Signedness::Unsigned;
default:
return None;
}
}
DIStringType *DIStringType::getImpl(LLVMContext &Context, unsigned Tag,
MDString *Name, Metadata *StringLength,
Metadata *StringLengthExp,
uint64_t SizeInBits, uint32_t AlignInBits,
unsigned Encoding, StorageType Storage,
bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIStringType, (Tag, Name, StringLength, StringLengthExp,
SizeInBits, AlignInBits, Encoding));
Metadata *Ops[] = {nullptr, nullptr, Name, StringLength, StringLengthExp};
DEFINE_GETIMPL_STORE(DIStringType, (Tag, SizeInBits, AlignInBits, Encoding),
Ops);
}
DIDerivedType *DIDerivedType::getImpl(
LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
uint32_t AlignInBits, uint64_t OffsetInBits,
Optional<unsigned> DWARFAddressSpace, DIFlags Flags, Metadata *ExtraData,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIDerivedType,
(Tag, Name, File, Line, Scope, BaseType, SizeInBits,
AlignInBits, OffsetInBits, DWARFAddressSpace, Flags,
ExtraData));
Metadata *Ops[] = {File, Scope, Name, BaseType, ExtraData};
DEFINE_GETIMPL_STORE(
DIDerivedType, (Tag, Line, SizeInBits, AlignInBits, OffsetInBits,
DWARFAddressSpace, Flags), Ops);
}
DICompositeType *DICompositeType::getImpl(
LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *File,
unsigned Line, Metadata *Scope, Metadata *BaseType, uint64_t SizeInBits,
uint32_t AlignInBits, uint64_t OffsetInBits, DIFlags Flags,
Metadata *Elements, unsigned RuntimeLang, Metadata *VTableHolder,
Metadata *TemplateParams, MDString *Identifier, Metadata *Discriminator,
Metadata *DataLocation, Metadata *Associated, Metadata *Allocated,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
// Keep this in sync with buildODRType.
DEFINE_GETIMPL_LOOKUP(DICompositeType,
(Tag, Name, File, Line, Scope, BaseType, SizeInBits,
AlignInBits, OffsetInBits, Flags, Elements,
RuntimeLang, VTableHolder, TemplateParams, Identifier,
Discriminator, DataLocation, Associated, Allocated));
Metadata *Ops[] = {File, Scope, Name, BaseType,
Elements, VTableHolder, TemplateParams, Identifier,
Discriminator, DataLocation, Associated, Allocated};
DEFINE_GETIMPL_STORE(DICompositeType, (Tag, Line, RuntimeLang, SizeInBits,
AlignInBits, OffsetInBits, Flags),
Ops);
}
DICompositeType *DICompositeType::buildODRType(
LLVMContext &Context, MDString &Identifier, unsigned Tag, MDString *Name,
Metadata *File, unsigned Line, Metadata *Scope, Metadata *BaseType,
uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
DIFlags Flags, Metadata *Elements, unsigned RuntimeLang,
Metadata *VTableHolder, Metadata *TemplateParams, Metadata *Discriminator,
Metadata *DataLocation, Metadata *Associated, Metadata *Allocated) {
assert(!Identifier.getString().empty() && "Expected valid identifier");
if (!Context.isODRUniquingDebugTypes())
return nullptr;
auto *&CT = (*Context.pImpl->DITypeMap)[&Identifier];
if (!CT)
return CT = DICompositeType::getDistinct(
Context, Tag, Name, File, Line, Scope, BaseType, SizeInBits,
AlignInBits, OffsetInBits, Flags, Elements, RuntimeLang,
VTableHolder, TemplateParams, &Identifier, Discriminator,
DataLocation, Associated, Allocated);
// Only mutate CT if it's a forward declaration and the new operands aren't.
assert(CT->getRawIdentifier() == &Identifier && "Wrong ODR identifier?");
if (!CT->isForwardDecl() || (Flags & DINode::FlagFwdDecl))
return CT;
// Mutate CT in place. Keep this in sync with getImpl.
CT->mutate(Tag, Line, RuntimeLang, SizeInBits, AlignInBits, OffsetInBits,
Flags);
Metadata *Ops[] = {File, Scope, Name, BaseType,
Elements, VTableHolder, TemplateParams, &Identifier,
Discriminator, DataLocation, Associated, Allocated};
assert((std::end(Ops) - std::begin(Ops)) == (int)CT->getNumOperands() &&
"Mismatched number of operands");
for (unsigned I = 0, E = CT->getNumOperands(); I != E; ++I)
if (Ops[I] != CT->getOperand(I))
CT->setOperand(I, Ops[I]);
return CT;
}
DICompositeType *DICompositeType::getODRType(
LLVMContext &Context, MDString &Identifier, unsigned Tag, MDString *Name,
Metadata *File, unsigned Line, Metadata *Scope, Metadata *BaseType,
uint64_t SizeInBits, uint32_t AlignInBits, uint64_t OffsetInBits,
DIFlags Flags, Metadata *Elements, unsigned RuntimeLang,
Metadata *VTableHolder, Metadata *TemplateParams, Metadata *Discriminator,
Metadata *DataLocation, Metadata *Associated, Metadata *Allocated) {
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, Discriminator, DataLocation, Associated,
Allocated);
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, DIFlags Flags,
uint8_t CC, Metadata *TypeArray,
StorageType Storage,
bool ShouldCreate) {
DEFINE_GETIMPL_LOOKUP(DISubroutineType, (Flags, CC, TypeArray));
Metadata *Ops[] = {nullptr, nullptr, nullptr, TypeArray};
DEFINE_GETIMPL_STORE(DISubroutineType, (Flags, CC), Ops);
}
// FIXME: Implement this string-enum correspondence with a .def file and macros,
// so that the association is explicit rather than implied.
static const char *ChecksumKindName[DIFile::CSK_Last] = {
"CSK_MD5",
"CSK_SHA1",
"CSK_SHA256",
};
StringRef DIFile::getChecksumKindAsString(ChecksumKind CSKind) {
assert(CSKind <= DIFile::CSK_Last && "Invalid checksum kind");
// The first space was originally the CSK_None variant, which is now
// obsolete, but the space is still reserved in ChecksumKind, so we account
// for it here.
return ChecksumKindName[CSKind - 1];
}
Optional<DIFile::ChecksumKind> DIFile::getChecksumKind(StringRef CSKindStr) {
return StringSwitch<Optional<DIFile::ChecksumKind>>(CSKindStr)
.Case("CSK_MD5", DIFile::CSK_MD5)
.Case("CSK_SHA1", DIFile::CSK_SHA1)
.Case("CSK_SHA256", DIFile::CSK_SHA256)
.Default(None);
}
DIFile *DIFile::getImpl(LLVMContext &Context, MDString *Filename,
MDString *Directory,
Optional<DIFile::ChecksumInfo<MDString *>> CS,
Optional<MDString *> Source, StorageType Storage,
bool ShouldCreate) {
assert(isCanonical(Filename) && "Expected canonical MDString");
assert(isCanonical(Directory) && "Expected canonical MDString");
assert((!CS || isCanonical(CS->Value)) && "Expected canonical MDString");
assert((!Source || isCanonical(*Source)) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIFile, (Filename, Directory, CS, Source));
Metadata *Ops[] = {Filename, Directory, CS ? CS->Value : nullptr,
Source.getValueOr(nullptr)};
DEFINE_GETIMPL_STORE(DIFile, (CS, Source), Ops);
}
DICompileUnit *DICompileUnit::getImpl(
LLVMContext &Context, unsigned SourceLanguage, Metadata *File,
MDString *Producer, bool IsOptimized, MDString *Flags,
unsigned RuntimeVersion, MDString *SplitDebugFilename,
unsigned EmissionKind, Metadata *EnumTypes, Metadata *RetainedTypes,
Metadata *GlobalVariables, Metadata *ImportedEntities, Metadata *Macros,
uint64_t DWOId, bool SplitDebugInlining, bool DebugInfoForProfiling,
unsigned NameTableKind, bool RangesBaseAddress, MDString *SysRoot,
MDString *SDK, StorageType Storage, bool ShouldCreate) {
assert(Storage != Uniqued && "Cannot unique DICompileUnit");
assert(isCanonical(Producer) && "Expected canonical MDString");
assert(isCanonical(Flags) && "Expected canonical MDString");
assert(isCanonical(SplitDebugFilename) && "Expected canonical MDString");
Metadata *Ops[] = {File,
Producer,
Flags,
SplitDebugFilename,
EnumTypes,
RetainedTypes,
GlobalVariables,
ImportedEntities,
Macros,
SysRoot,
SDK};
return storeImpl(new (array_lengthof(Ops)) DICompileUnit(
Context, Storage, SourceLanguage, IsOptimized,
RuntimeVersion, EmissionKind, DWOId, SplitDebugInlining,
DebugInfoForProfiling, NameTableKind, RangesBaseAddress,
Ops),
Storage);
}
Optional<DICompileUnit::DebugEmissionKind>
DICompileUnit::getEmissionKind(StringRef Str) {
return StringSwitch<Optional<DebugEmissionKind>>(Str)
.Case("NoDebug", NoDebug)
.Case("FullDebug", FullDebug)
.Case("LineTablesOnly", LineTablesOnly)
.Case("DebugDirectivesOnly", DebugDirectivesOnly)
.Default(None);
}
Optional<DICompileUnit::DebugNameTableKind>
DICompileUnit::getNameTableKind(StringRef Str) {
return StringSwitch<Optional<DebugNameTableKind>>(Str)
.Case("Default", DebugNameTableKind::Default)
.Case("GNU", DebugNameTableKind::GNU)
.Case("None", DebugNameTableKind::None)
.Default(None);
}
const char *DICompileUnit::emissionKindString(DebugEmissionKind EK) {
switch (EK) {
case NoDebug: return "NoDebug";
case FullDebug: return "FullDebug";
case LineTablesOnly: return "LineTablesOnly";
case DebugDirectivesOnly: return "DebugDirectivesOnly";
}
return nullptr;
}
const char *DICompileUnit::nameTableKindString(DebugNameTableKind NTK) {
switch (NTK) {
case DebugNameTableKind::Default:
return nullptr;
case DebugNameTableKind::GNU:
return "GNU";
case DebugNameTableKind::None:
return "None";
}
return nullptr;
}
DISubprogram *DILocalScope::getSubprogram() const {
if (auto *Block = dyn_cast<DILexicalBlockBase>(this))
return Block->getScope()->getSubprogram();
return const_cast<DISubprogram *>(cast<DISubprogram>(this));
}
DILocalScope *DILocalScope::getNonLexicalBlockFileScope() const {
if (auto *File = dyn_cast<DILexicalBlockFile>(this))
return File->getScope()->getNonLexicalBlockFileScope();
return const_cast<DILocalScope *>(this);
}
DISubprogram::DISPFlags DISubprogram::getFlag(StringRef Flag) {
return StringSwitch<DISPFlags>(Flag)
#define HANDLE_DISP_FLAG(ID, NAME) .Case("DISPFlag" #NAME, SPFlag##NAME)
#include "llvm/IR/DebugInfoFlags.def"
.Default(SPFlagZero);
}
StringRef DISubprogram::getFlagString(DISPFlags Flag) {
switch (Flag) {
// Appease a warning.
case SPFlagVirtuality:
return "";
#define HANDLE_DISP_FLAG(ID, NAME) \
case SPFlag##NAME: \
return "DISPFlag" #NAME;
#include "llvm/IR/DebugInfoFlags.def"
}
return "";
}
DISubprogram::DISPFlags
DISubprogram::splitFlags(DISPFlags Flags,
SmallVectorImpl<DISPFlags> &SplitFlags) {
// Multi-bit fields can require special handling. In our case, however, the
// only multi-bit field is virtuality, and all its values happen to be
// single-bit values, so the right behavior just falls out.
#define HANDLE_DISP_FLAG(ID, NAME) \
if (DISPFlags Bit = Flags & SPFlag##NAME) { \
SplitFlags.push_back(Bit); \
Flags &= ~Bit; \
}
#include "llvm/IR/DebugInfoFlags.def"
return Flags;
}
DISubprogram *DISubprogram::getImpl(
LLVMContext &Context, Metadata *Scope, MDString *Name,
MDString *LinkageName, Metadata *File, unsigned Line, Metadata *Type,
unsigned ScopeLine, Metadata *ContainingType, unsigned VirtualIndex,
int ThisAdjustment, DIFlags Flags, DISPFlags SPFlags, Metadata *Unit,
Metadata *TemplateParams, Metadata *Declaration, Metadata *RetainedNodes,
Metadata *ThrownTypes, StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
assert(isCanonical(LinkageName) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DISubprogram,
(Scope, Name, LinkageName, File, Line, Type, ScopeLine,
ContainingType, VirtualIndex, ThisAdjustment, Flags,
SPFlags, Unit, TemplateParams, Declaration,
RetainedNodes, ThrownTypes));
SmallVector<Metadata *, 11> Ops = {
File, Scope, Name, LinkageName, Type, Unit,
Declaration, RetainedNodes, ContainingType, TemplateParams, ThrownTypes};
if (!ThrownTypes) {
Ops.pop_back();
if (!TemplateParams) {
Ops.pop_back();
if (!ContainingType)
Ops.pop_back();
}
}
DEFINE_GETIMPL_STORE_N(
DISubprogram,
(Line, ScopeLine, VirtualIndex, ThisAdjustment, Flags, SPFlags), Ops,
Ops.size());
}
bool DISubprogram::describes(const Function *F) const {
assert(F && "Invalid function");
return F->getSubprogram() == this;
}
DILexicalBlock *DILexicalBlock::getImpl(LLVMContext &Context, Metadata *Scope,
Metadata *File, unsigned Line,
unsigned Column, StorageType Storage,
bool ShouldCreate) {
// Fixup column.
adjustColumn(Column);
assert(Scope && "Expected scope");
DEFINE_GETIMPL_LOOKUP(DILexicalBlock, (Scope, File, Line, Column));
Metadata *Ops[] = {File, Scope};
DEFINE_GETIMPL_STORE(DILexicalBlock, (Line, Column), Ops);
}
DILexicalBlockFile *DILexicalBlockFile::getImpl(LLVMContext &Context,
Metadata *Scope, Metadata *File,
unsigned Discriminator,
StorageType Storage,
bool ShouldCreate) {
assert(Scope && "Expected scope");
DEFINE_GETIMPL_LOOKUP(DILexicalBlockFile, (Scope, File, Discriminator));
Metadata *Ops[] = {File, Scope};
DEFINE_GETIMPL_STORE(DILexicalBlockFile, (Discriminator), Ops);
}
DINamespace *DINamespace::getImpl(LLVMContext &Context, Metadata *Scope,
MDString *Name, bool ExportSymbols,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DINamespace, (Scope, Name, ExportSymbols));
// The nullptr is for DIScope's File operand. This should be refactored.
Metadata *Ops[] = {nullptr, Scope, Name};
DEFINE_GETIMPL_STORE(DINamespace, (ExportSymbols), Ops);
}
DICommonBlock *DICommonBlock::getImpl(LLVMContext &Context, Metadata *Scope,
Metadata *Decl, MDString *Name,
Metadata *File, unsigned LineNo,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DICommonBlock, (Scope, Decl, Name, File, LineNo));
// The nullptr is for DIScope's File operand. This should be refactored.
Metadata *Ops[] = {Scope, Decl, Name, File};
DEFINE_GETIMPL_STORE(DICommonBlock, (LineNo), Ops);
}
DIModule *DIModule::getImpl(LLVMContext &Context, Metadata *File,
Metadata *Scope, MDString *Name,
MDString *ConfigurationMacros,
MDString *IncludePath, MDString *APINotesFile,
unsigned LineNo, StorageType Storage,
bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIModule, (File, Scope, Name, ConfigurationMacros,
IncludePath, APINotesFile, LineNo));
Metadata *Ops[] = {File, Scope, Name, ConfigurationMacros,
IncludePath, APINotesFile};
DEFINE_GETIMPL_STORE(DIModule, (LineNo), Ops);
}
DITemplateTypeParameter *
DITemplateTypeParameter::getImpl(LLVMContext &Context, MDString *Name,
Metadata *Type, bool isDefault,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DITemplateTypeParameter, (Name, Type, isDefault));
Metadata *Ops[] = {Name, Type};
DEFINE_GETIMPL_STORE(DITemplateTypeParameter, (isDefault), Ops);
}
DITemplateValueParameter *DITemplateValueParameter::getImpl(
LLVMContext &Context, unsigned Tag, MDString *Name, Metadata *Type,
bool isDefault, Metadata *Value, StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DITemplateValueParameter,
(Tag, Name, Type, isDefault, Value));
Metadata *Ops[] = {Name, Type, Value};
DEFINE_GETIMPL_STORE(DITemplateValueParameter, (Tag, isDefault), Ops);
}
DIGlobalVariable *
DIGlobalVariable::getImpl(LLVMContext &Context, Metadata *Scope, MDString *Name,
MDString *LinkageName, Metadata *File, unsigned Line,
Metadata *Type, bool IsLocalToUnit, bool IsDefinition,
Metadata *StaticDataMemberDeclaration,
Metadata *TemplateParams, uint32_t AlignInBits,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
assert(isCanonical(LinkageName) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIGlobalVariable, (Scope, Name, LinkageName, File, Line,
Type, IsLocalToUnit, IsDefinition,
StaticDataMemberDeclaration,
TemplateParams, AlignInBits));
Metadata *Ops[] = {Scope,
Name,
File,
Type,
Name,
LinkageName,
StaticDataMemberDeclaration,
TemplateParams};
DEFINE_GETIMPL_STORE(DIGlobalVariable,
(Line, IsLocalToUnit, IsDefinition, AlignInBits), Ops);
}
DILocalVariable *DILocalVariable::getImpl(LLVMContext &Context, Metadata *Scope,
MDString *Name, Metadata *File,
unsigned Line, Metadata *Type,
unsigned Arg, DIFlags Flags,
uint32_t AlignInBits,
StorageType Storage,
bool ShouldCreate) {
// 64K ought to be enough for any frontend.
assert(Arg <= UINT16_MAX && "Expected argument number to fit in 16-bits");
assert(Scope && "Expected scope");
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DILocalVariable,
(Scope, Name, File, Line, Type, Arg, Flags,
AlignInBits));
Metadata *Ops[] = {Scope, Name, File, Type};
DEFINE_GETIMPL_STORE(DILocalVariable, (Line, Arg, Flags, AlignInBits), Ops);
}
Optional<uint64_t> DIVariable::getSizeInBits() const {
// This is used by the Verifier so be mindful of broken types.
const Metadata *RawType = getRawType();
while (RawType) {
// Try to get the size directly.
if (auto *T = dyn_cast<DIType>(RawType))
if (uint64_t Size = T->getSizeInBits())
return Size;
if (auto *DT = dyn_cast<DIDerivedType>(RawType)) {
// Look at the base type.
RawType = DT->getRawBaseType();
continue;
}
// Missing type or size.
break;
}
// Fail gracefully.
return None;
}
DILabel *DILabel::getImpl(LLVMContext &Context, Metadata *Scope,
MDString *Name, Metadata *File, unsigned Line,
StorageType Storage,
bool ShouldCreate) {
assert(Scope && "Expected scope");
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DILabel,
(Scope, Name, File, Line));
Metadata *Ops[] = {Scope, Name, File};
DEFINE_GETIMPL_STORE(DILabel, (Line), Ops);
}
DIExpression *DIExpression::getImpl(LLVMContext &Context,
ArrayRef<uint64_t> Elements,
StorageType Storage, bool ShouldCreate) {
DEFINE_GETIMPL_LOOKUP(DIExpression, (Elements));
DEFINE_GETIMPL_STORE_NO_OPS(DIExpression, (Elements));
}
unsigned DIExpression::ExprOperand::getSize() const {
uint64_t Op = getOp();
if (Op >= dwarf::DW_OP_breg0 && Op <= dwarf::DW_OP_breg31)
return 2;
switch (Op) {
case dwarf::DW_OP_LLVM_convert:
case dwarf::DW_OP_LLVM_fragment:
case dwarf::DW_OP_bregx:
return 3;
case dwarf::DW_OP_constu:
case dwarf::DW_OP_consts:
case dwarf::DW_OP_deref_size:
case dwarf::DW_OP_plus_uconst:
case dwarf::DW_OP_LLVM_tag_offset:
case dwarf::DW_OP_LLVM_entry_value:
case dwarf::DW_OP_regx:
return 2;
default:
return 1;
}
}
bool DIExpression::isValid() const {
for (auto I = expr_op_begin(), E = expr_op_end(); I != E; ++I) {
// Check that there's space for the operand.
if (I->get() + I->getSize() > E->get())
return false;
uint64_t Op = I->getOp();
if ((Op >= dwarf::DW_OP_reg0 && Op <= dwarf::DW_OP_reg31) ||
(Op >= dwarf::DW_OP_breg0 && Op <= dwarf::DW_OP_breg31))
return true;
// Check that the operand is valid.
switch (Op) {
default:
return false;
case dwarf::DW_OP_LLVM_fragment:
// A fragment operator must appear at the end.
return I->get() + I->getSize() == E->get();
case dwarf::DW_OP_stack_value: {
// Must be the last one or followed by a DW_OP_LLVM_fragment.
if (I->get() + I->getSize() == E->get())
break;
auto J = I;
if ((++J)->getOp() != dwarf::DW_OP_LLVM_fragment)
return false;
break;
}
case dwarf::DW_OP_swap: {
// Must be more than one implicit element on the stack.
// FIXME: A better way to implement this would be to add a local variable
// that keeps track of the stack depth and introduce something like a
// DW_LLVM_OP_implicit_location as a placeholder for the location this
// DIExpression is attached to, or else pass the number of implicit stack
// elements into isValid.
if (getNumElements() == 1)
return false;
break;
}
case dwarf::DW_OP_LLVM_entry_value: {
// An entry value operator must appear at the beginning and the number of
// operations it cover can currently only be 1, because we support only
// entry values of a simple register location. One reason for this is that
// we currently can't calculate the size of the resulting DWARF block for
// other expressions.
return I->get() == expr_op_begin()->get() && I->getArg(0) == 1 &&
getNumElements() == 2;
}
case dwarf::DW_OP_LLVM_convert:
case dwarf::DW_OP_LLVM_tag_offset:
case dwarf::DW_OP_constu:
case dwarf::DW_OP_plus_uconst:
case dwarf::DW_OP_plus:
case dwarf::DW_OP_minus:
case dwarf::DW_OP_mul:
case dwarf::DW_OP_div:
case dwarf::DW_OP_mod:
case dwarf::DW_OP_or:
case dwarf::DW_OP_and:
case dwarf::DW_OP_xor:
case dwarf::DW_OP_shl:
case dwarf::DW_OP_shr:
case dwarf::DW_OP_shra:
case dwarf::DW_OP_deref:
case dwarf::DW_OP_deref_size:
case dwarf::DW_OP_xderef:
case dwarf::DW_OP_lit0:
case dwarf::DW_OP_not:
case dwarf::DW_OP_dup:
case dwarf::DW_OP_regx:
case dwarf::DW_OP_bregx:
case dwarf::DW_OP_push_object_address:
break;
}
}
return true;
}
bool DIExpression::isImplicit() const {
if (!isValid())
return false;
if (getNumElements() == 0)
return false;
for (const auto &It : expr_ops()) {
switch (It.getOp()) {
default:
break;
case dwarf::DW_OP_stack_value:
case dwarf::DW_OP_LLVM_tag_offset:
return true;
}
}
return false;
}
bool DIExpression::isComplex() const {
if (!isValid())
return false;
if (getNumElements() == 0)
return false;
// If there are any elements other than fragment or tag_offset, then some
// kind of complex computation occurs.
for (const auto &It : expr_ops()) {
switch (It.getOp()) {
case dwarf::DW_OP_LLVM_tag_offset:
case dwarf::DW_OP_LLVM_fragment:
continue;
default: return true;
}
}
return false;
}
Optional<DIExpression::FragmentInfo>
DIExpression::getFragmentInfo(expr_op_iterator Start, expr_op_iterator End) {
for (auto I = Start; I != End; ++I)
if (I->getOp() == dwarf::DW_OP_LLVM_fragment) {
DIExpression::FragmentInfo Info = {I->getArg(1), I->getArg(0)};
return Info;
}
return None;
}
void DIExpression::appendOffset(SmallVectorImpl<uint64_t> &Ops,
int64_t Offset) {
if (Offset > 0) {
Ops.push_back(dwarf::DW_OP_plus_uconst);
Ops.push_back(Offset);
} else if (Offset < 0) {
Ops.push_back(dwarf::DW_OP_constu);
Ops.push_back(-Offset);
Ops.push_back(dwarf::DW_OP_minus);
}
}
bool DIExpression::extractIfOffset(int64_t &Offset) const {
if (getNumElements() == 0) {
Offset = 0;
return true;
}
if (getNumElements() == 2 && Elements[0] == dwarf::DW_OP_plus_uconst) {
Offset = Elements[1];
return true;
}
if (getNumElements() == 3 && Elements[0] == dwarf::DW_OP_constu) {
if (Elements[2] == dwarf::DW_OP_plus) {
Offset = Elements[1];
return true;
}
if (Elements[2] == dwarf::DW_OP_minus) {
Offset = -Elements[1];
return true;
}
}
return false;
}
const DIExpression *DIExpression::extractAddressClass(const DIExpression *Expr,
unsigned &AddrClass) {
// FIXME: This seems fragile. Nothing that verifies that these elements
// actually map to ops and not operands.
const unsigned PatternSize = 4;
if (Expr->Elements.size() >= PatternSize &&
Expr->Elements[PatternSize - 4] == dwarf::DW_OP_constu &&
Expr->Elements[PatternSize - 2] == dwarf::DW_OP_swap &&
Expr->Elements[PatternSize - 1] == dwarf::DW_OP_xderef) {
AddrClass = Expr->Elements[PatternSize - 3];
if (Expr->Elements.size() == PatternSize)
return nullptr;
return DIExpression::get(Expr->getContext(),
makeArrayRef(&*Expr->Elements.begin(),
Expr->Elements.size() - PatternSize));
}
return Expr;
}
DIExpression *DIExpression::prepend(const DIExpression *Expr, uint8_t Flags,
int64_t Offset) {
SmallVector<uint64_t, 8> Ops;
if (Flags & DIExpression::DerefBefore)
Ops.push_back(dwarf::DW_OP_deref);
appendOffset(Ops, Offset);
if (Flags & DIExpression::DerefAfter)
Ops.push_back(dwarf::DW_OP_deref);
bool StackValue = Flags & DIExpression::StackValue;
bool EntryValue = Flags & DIExpression::EntryValue;
return prependOpcodes(Expr, Ops, StackValue, EntryValue);
}
DIExpression *DIExpression::prependOpcodes(const DIExpression *Expr,
SmallVectorImpl<uint64_t> &Ops,
bool StackValue,
bool EntryValue) {
assert(Expr && "Can't prepend ops to this expression");
if (EntryValue) {
Ops.push_back(dwarf::DW_OP_LLVM_entry_value);
// Add size info needed for entry value expression.
// Add plus one for target register operand.
Ops.push_back(Expr->getNumElements() + 1);
}
// If there are no ops to prepend, do not even add the DW_OP_stack_value.
if (Ops.empty())
StackValue = false;
for (auto Op : Expr->expr_ops()) {
// A DW_OP_stack_value comes at the end, but before a DW_OP_LLVM_fragment.
if (StackValue) {
if (Op.getOp() == dwarf::DW_OP_stack_value)
StackValue = false;
else if (Op.getOp() == dwarf::DW_OP_LLVM_fragment) {
Ops.push_back(dwarf::DW_OP_stack_value);
StackValue = false;
}
}
Op.appendToVector(Ops);
}
if (StackValue)
Ops.push_back(dwarf::DW_OP_stack_value);
return DIExpression::get(Expr->getContext(), Ops);
}
DIExpression *DIExpression::append(const DIExpression *Expr,
ArrayRef<uint64_t> Ops) {
assert(Expr && !Ops.empty() && "Can't append ops to this expression");
// Copy Expr's current op list.
SmallVector<uint64_t, 16> NewOps;
for (auto Op : Expr->expr_ops()) {
// Append new opcodes before DW_OP_{stack_value, LLVM_fragment}.
if (Op.getOp() == dwarf::DW_OP_stack_value ||
Op.getOp() == dwarf::DW_OP_LLVM_fragment) {
NewOps.append(Ops.begin(), Ops.end());
// Ensure that the new opcodes are only appended once.
Ops = None;
}
Op.appendToVector(NewOps);
}
NewOps.append(Ops.begin(), Ops.end());
auto *result = DIExpression::get(Expr->getContext(), NewOps);
assert(result->isValid() && "concatenated expression is not valid");
return result;
}
DIExpression *DIExpression::appendToStack(const DIExpression *Expr,
ArrayRef<uint64_t> Ops) {
assert(Expr && !Ops.empty() && "Can't append ops to this expression");
assert(none_of(Ops,
[](uint64_t Op) {
return Op == dwarf::DW_OP_stack_value ||
Op == dwarf::DW_OP_LLVM_fragment;
}) &&
"Can't append this op");
// Append a DW_OP_deref after Expr's current op list if it's non-empty and
// has no DW_OP_stack_value.
//
// Match .* DW_OP_stack_value (DW_OP_LLVM_fragment A B)?.
Optional<FragmentInfo> FI = Expr->getFragmentInfo();
unsigned DropUntilStackValue = FI.hasValue() ? 3 : 0;
ArrayRef<uint64_t> ExprOpsBeforeFragment =
Expr->getElements().drop_back(DropUntilStackValue);
bool NeedsDeref = (Expr->getNumElements() > DropUntilStackValue) &&
(ExprOpsBeforeFragment.back() != dwarf::DW_OP_stack_value);
bool NeedsStackValue = NeedsDeref || ExprOpsBeforeFragment.empty();
// Append a DW_OP_deref after Expr's current op list if needed, then append
// the new ops, and finally ensure that a single DW_OP_stack_value is present.
SmallVector<uint64_t, 16> NewOps;
if (NeedsDeref)
NewOps.push_back(dwarf::DW_OP_deref);
NewOps.append(Ops.begin(), Ops.end());
if (NeedsStackValue)
NewOps.push_back(dwarf::DW_OP_stack_value);
return DIExpression::append(Expr, NewOps);
}
Optional<DIExpression *> DIExpression::createFragmentExpression(
const DIExpression *Expr, unsigned OffsetInBits, unsigned SizeInBits) {
SmallVector<uint64_t, 8> Ops;
// Copy over the expression, but leave off any trailing DW_OP_LLVM_fragment.
if (Expr) {
for (auto Op : Expr->expr_ops()) {
switch (Op.getOp()) {
default: break;
case dwarf::DW_OP_shr:
case dwarf::DW_OP_shra:
case dwarf::DW_OP_shl:
case dwarf::DW_OP_plus:
case dwarf::DW_OP_plus_uconst:
case dwarf::DW_OP_minus:
// We can't safely split arithmetic or shift operations into multiple
// fragments because we can't express carry-over between fragments.
//
// FIXME: We *could* preserve the lowest fragment of a constant offset
// operation if the offset fits into SizeInBits.
return None;
case dwarf::DW_OP_LLVM_fragment: {
// Make the new offset point into the existing fragment.
uint64_t FragmentOffsetInBits = Op.getArg(0);
uint64_t FragmentSizeInBits = Op.getArg(1);
(void)FragmentSizeInBits;
assert((OffsetInBits + SizeInBits <= FragmentSizeInBits) &&
"new fragment outside of original fragment");
OffsetInBits += FragmentOffsetInBits;
continue;
}
}
Op.appendToVector(Ops);
}
}
assert(Expr && "Unknown DIExpression");
Ops.push_back(dwarf::DW_OP_LLVM_fragment);
Ops.push_back(OffsetInBits);
Ops.push_back(SizeInBits);
return DIExpression::get(Expr->getContext(), Ops);
}
bool DIExpression::isConstant() const {
// Recognize DW_OP_constu C DW_OP_stack_value (DW_OP_LLVM_fragment Len Ofs)?.
if (getNumElements() != 3 && getNumElements() != 6)
return false;
if (getElement(0) != dwarf::DW_OP_constu ||
getElement(2) != dwarf::DW_OP_stack_value)
return false;
if (getNumElements() == 6 && getElement(3) != dwarf::DW_OP_LLVM_fragment)
return false;
return true;
}
DIExpression::ExtOps DIExpression::getExtOps(unsigned FromSize, unsigned ToSize,
bool Signed) {
dwarf::TypeKind TK = Signed ? dwarf::DW_ATE_signed : dwarf::DW_ATE_unsigned;
DIExpression::ExtOps Ops{{dwarf::DW_OP_LLVM_convert, FromSize, TK,
dwarf::DW_OP_LLVM_convert, ToSize, TK}};
return Ops;
}
DIExpression *DIExpression::appendExt(const DIExpression *Expr,
unsigned FromSize, unsigned ToSize,
bool Signed) {
return appendToStack(Expr, getExtOps(FromSize, ToSize, Signed));
}
DIGlobalVariableExpression *
DIGlobalVariableExpression::getImpl(LLVMContext &Context, Metadata *Variable,
Metadata *Expression, StorageType Storage,
bool ShouldCreate) {
DEFINE_GETIMPL_LOOKUP(DIGlobalVariableExpression, (Variable, Expression));
Metadata *Ops[] = {Variable, Expression};
DEFINE_GETIMPL_STORE_NO_CONSTRUCTOR_ARGS(DIGlobalVariableExpression, Ops);
}
DIObjCProperty *DIObjCProperty::getImpl(
LLVMContext &Context, MDString *Name, Metadata *File, unsigned Line,
MDString *GetterName, MDString *SetterName, unsigned Attributes,
Metadata *Type, StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
assert(isCanonical(GetterName) && "Expected canonical MDString");
assert(isCanonical(SetterName) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIObjCProperty, (Name, File, Line, GetterName,
SetterName, Attributes, Type));
Metadata *Ops[] = {Name, File, GetterName, SetterName, Type};
DEFINE_GETIMPL_STORE(DIObjCProperty, (Line, Attributes), Ops);
}
DIImportedEntity *DIImportedEntity::getImpl(LLVMContext &Context, unsigned Tag,
Metadata *Scope, Metadata *Entity,
Metadata *File, unsigned Line,
MDString *Name, StorageType Storage,
bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIImportedEntity,
(Tag, Scope, Entity, File, Line, Name));
Metadata *Ops[] = {Scope, Entity, Name, File};
DEFINE_GETIMPL_STORE(DIImportedEntity, (Tag, Line), Ops);
}
DIMacro *DIMacro::getImpl(LLVMContext &Context, unsigned MIType,
unsigned Line, MDString *Name, MDString *Value,
StorageType Storage, bool ShouldCreate) {
assert(isCanonical(Name) && "Expected canonical MDString");
DEFINE_GETIMPL_LOOKUP(DIMacro, (MIType, Line, Name, Value));
Metadata *Ops[] = { Name, Value };
DEFINE_GETIMPL_STORE(DIMacro, (MIType, Line), Ops);
}
DIMacroFile *DIMacroFile::getImpl(LLVMContext &Context, unsigned MIType,
unsigned Line, Metadata *File,
Metadata *Elements, StorageType Storage,
bool ShouldCreate) {
DEFINE_GETIMPL_LOOKUP(DIMacroFile,
(MIType, Line, File, Elements));
Metadata *Ops[] = { File, Elements };
DEFINE_GETIMPL_STORE(DIMacroFile, (MIType, Line), Ops);
}
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