/// overloads) to guarantee that particularly important cases (cstring plus
/// StringRef) codegen as desired.
class Twine {
+ friend Twine operator+(const char *LHS, const StringRef &RHS);
+ friend Twine operator+(const StringRef &LHS, const char *RHS);
+ friend Twine operator+(const StringRef &LHS, const StringRef &RHS);
+
/// NodeKind - Represent the type of an argument.
enum NodeKind : unsigned char {
/// An empty string; the result of concatenating anything with it is also
assert(isNullary() && "Invalid kind!");
}
+ // While there are some valid use cases for copying Twines, most of them
+ // are confined to the implementation of Twine itself, and Twine itself is
+ // not intended to be publicly copyable since it can very easily lead to
+ // dangling pointers / references.
+ Twine(const Twine &) = default;
+
/// Construct a binary twine.
explicit Twine(const Twine &LHS, const Twine &RHS)
: LHSKind(TwineKind), RHSKind(TwineKind) {
assert(isValid() && "Invalid twine!");
}
- Twine(const Twine &) = default;
-
/// Construct from a C string.
///
/// We take care here to optimize "" into the empty twine -- this will be
assert(isValid() && "Invalid twine!");
}
+ Twine(Twine &&Other) = default;
+
/// Construct from an std::string.
/*implicit*/ Twine(const std::string &Str)
: LHSKind(StdStringKind), RHSKind(EmptyKind) {
assert(isValid() && "Invalid twine!");
}
+ /// Construct as the concatenation of two StringRefs.
+ /*implicit*/ Twine(const StringRef &LHS, const StringRef &RHS)
+ : LHSKind(StringRefKind), RHSKind(StringRefKind) {
+ this->LHS.stringRef = &LHS;
+ this->RHS.stringRef = &RHS;
+ assert(isValid() && "Invalid twine!");
+ }
+
/// Since the intended use of twines is as temporary objects, assignments
/// when concatenating might cause undefined behavior or stack corruptions
Twine &operator=(const Twine &) = delete;
/// Dump the representation of this twine to stderr.
void dumpRepr() const;
+ friend inline Twine operator+(const Twine &LHS, const Twine &RHS) {
+ return LHS.concat(RHS);
+ }
+
/// @}
};
return Twine(NewLHS, NewLHSKind, NewRHS, NewRHSKind);
}
- inline Twine operator+(const Twine &LHS, const Twine &RHS) {
- return LHS.concat(RHS);
- }
-
/// Additional overload to guarantee simplified codegen; this is equivalent to
/// concat().
return Twine(LHS, RHS);
}
- /// Additional overload to guarantee simplified codegen; this is equivalent to
- /// concat().
-
inline Twine operator+(const StringRef &LHS, const char *RHS) {
return Twine(LHS, RHS);
}
+ inline Twine operator+(const StringRef &LHS, const StringRef &RHS) {
+ return Twine(LHS, RHS);
+ }
+
inline raw_ostream &operator<<(raw_ostream &OS, const Twine &RHS) {
RHS.print(OS);
return OS;
/// Diagnostic information for unsupported feature in backend.
class DiagnosticInfoUnsupported : public DiagnosticInfoWithLocationBase {
private:
- Twine Msg;
+ std::string Msg;
public:
/// \p Fn is the function where the diagnostic is being emitted. \p Loc is
const DiagnosticLocation &Loc = DiagnosticLocation(),
DiagnosticSeverity Severity = DS_Error)
: DiagnosticInfoWithLocationBase(DK_Unsupported, Severity, Fn, Loc),
- Msg(Msg) {}
+ Msg(Msg.str()) {}
static bool classof(const DiagnosticInfo *DI) {
return DI->getKind() == DK_Unsupported;
}
- const Twine &getMessage() const { return Msg; }
+ StringRef getMessage() const { return Msg; }
void print(DiagnosticPrinter &DP) const override;
};
class GenericBinaryError : public ErrorInfo<GenericBinaryError, BinaryError> {
public:
static char ID;
- GenericBinaryError(Twine Msg);
- GenericBinaryError(Twine Msg, object_error ECOverride);
+ GenericBinaryError(const Twine &Msg);
+ GenericBinaryError(const Twine &Msg, object_error ECOverride);
const std::string &getMessage() const { return Msg; }
void log(raw_ostream &OS) const override;
private:
class EmptyResError : public GenericBinaryError {
public:
- EmptyResError(Twine Msg, object_error ECOverride)
+ EmptyResError(const Twine &Msg, object_error ECOverride)
: GenericBinaryError(Msg, ECOverride) {}
};
/// This is useful in the base level of your program to allow clean termination
/// (allowing clean deallocation of resources, etc.), while reporting error
/// information to the user.
-void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner);
+void logAllUnhandledErrors(Error E, raw_ostream &OS, const Twine &ErrorBanner);
/// Write all error messages (if any) in E to a string. The newline character
/// is used to separate error messages.
};
template <typename T> class provider_format_adapter : public format_adapter {
- T Item;
+ T &Item;
public:
explicit provider_format_adapter(T &&Item) : Item(Item) {}
char BinaryError::ID = 0;
char GenericBinaryError::ID = 0;
-GenericBinaryError::GenericBinaryError(Twine Msg) : Msg(Msg.str()) {}
+GenericBinaryError::GenericBinaryError(const Twine &Msg) : Msg(Msg.str()) {}
-GenericBinaryError::GenericBinaryError(Twine Msg, object_error ECOverride)
+GenericBinaryError::GenericBinaryError(const Twine &Msg,
+ object_error ECOverride)
: Msg(Msg.str()) {
setErrorCode(make_error_code(ECOverride));
}
char ECError::ID = 0;
char StringError::ID = 0;
-void logAllUnhandledErrors(Error E, raw_ostream &OS, Twine ErrorBanner) {
+void logAllUnhandledErrors(Error E, raw_ostream &OS, const Twine &ErrorBanner) {
if (!E)
return;
OS << ErrorBanner;
<< Ptr.cString << "\"";
break;
case Twine::StdStringKind:
- OS << "std::string:\""
- << Ptr.stdString << "\"";
+ OS << "std::string:\"" << *Ptr.stdString << "\"";
break;
case Twine::StringRefKind:
- OS << "stringref:\""
- << Ptr.stringRef << "\"";
+ OS << "stringref:\"" << *Ptr.stringRef << "\"";
break;
case Twine::SmallStringKind:
OS << "smallstring:\"" << *Ptr.smallString << "\"";
class IRBuilderPrefixedInserter : public IRBuilderDefaultInserter {
std::string Prefix;
- const Twine getNameWithPrefix(const Twine &Name) const {
- return Name.isTriviallyEmpty() ? Name : Prefix + Name;
- }
-
public:
void SetNamePrefix(const Twine &P) { Prefix = P.str(); }
protected:
void InsertHelper(Instruction *I, const Twine &Name, BasicBlock *BB,
BasicBlock::iterator InsertPt) const {
- IRBuilderDefaultInserter::InsertHelper(I, getNameWithPrefix(Name), BB,
- InsertPt);
+ const Twine &Prefixed = Prefix + Name;
+ IRBuilderDefaultInserter::InsertHelper(
+ I, Name.isTriviallyEmpty() ? Name : Prefixed, BB, InsertPt);
}
};
/// This will return the BasePtr if that is valid, or build a new GEP
/// instruction using the IRBuilder if GEP-ing is needed.
static Value *buildGEP(IRBuilderTy &IRB, Value *BasePtr,
- SmallVectorImpl<Value *> &Indices, Twine NamePrefix) {
+ SmallVectorImpl<Value *> &Indices,
+ const Twine &NamePrefix) {
if (Indices.empty())
return BasePtr;
static Value *getNaturalGEPWithType(IRBuilderTy &IRB, const DataLayout &DL,
Value *BasePtr, Type *Ty, Type *TargetTy,
SmallVectorImpl<Value *> &Indices,
- Twine NamePrefix) {
+ const Twine &NamePrefix) {
if (Ty == TargetTy)
return buildGEP(IRB, BasePtr, Indices, NamePrefix);
Value *Ptr, Type *Ty, APInt &Offset,
Type *TargetTy,
SmallVectorImpl<Value *> &Indices,
- Twine NamePrefix) {
+ const Twine &NamePrefix) {
if (Offset == 0)
return getNaturalGEPWithType(IRB, DL, Ptr, Ty, TargetTy, Indices,
NamePrefix);
static Value *getNaturalGEPWithOffset(IRBuilderTy &IRB, const DataLayout &DL,
Value *Ptr, APInt Offset, Type *TargetTy,
SmallVectorImpl<Value *> &Indices,
- Twine NamePrefix) {
+ const Twine &NamePrefix) {
PointerType *Ty = cast<PointerType>(Ptr->getType());
// Don't consider any GEPs through an i8* as natural unless the TargetTy is
/// a single GEP as possible, thus making each GEP more independent of the
/// surrounding code.
static Value *getAdjustedPtr(IRBuilderTy &IRB, const DataLayout &DL, Value *Ptr,
- APInt Offset, Type *PointerTy, Twine NamePrefix) {
+ APInt Offset, Type *PointerTy,
+ const Twine &NamePrefix) {
// Even though we don't look through PHI nodes, we could be called on an
// instruction in an unreachable block, which may be on a cycle.
SmallPtrSet<Value *, 4> Visited;
std::string ToolName;
} // anonymous namespace
-static void error(Twine Message, Twine Path = Twine()) {
+static void error(const Twine &Message, const Twine &Path = Twine()) {
HadError = true;
errs() << ToolName << ": " << Path << ": " << Message << ".\n";
}
-static bool error(std::error_code EC, Twine Path = Twine()) {
+static bool error(std::error_code EC, const Twine &Path = Twine()) {
if (EC) {
error(EC.message(), Path);
return true;
}
}
-SectionBase *SectionTableRef::getSection(uint16_t Index, Twine ErrMsg) {
+SectionBase *SectionTableRef::getSection(uint16_t Index, const Twine &ErrMsg) {
if (Index == SHN_UNDEF || Index > Sections.size())
error(ErrMsg);
return Sections[Index - 1].get();
}
template <class T>
-T *SectionTableRef::getSectionOfType(uint16_t Index, Twine IndexErrMsg,
- Twine TypeErrMsg) {
+T *SectionTableRef::getSectionOfType(uint16_t Index, const Twine &IndexErrMsg,
+ const Twine &TypeErrMsg) {
if (T *Sec = llvm::dyn_cast<T>(getSection(Index, IndexErrMsg)))
return Sec;
error(TypeErrMsg);
: Sections(Secs) {}
SectionTableRef(const SectionTableRef &) = default;
- SectionBase *getSection(uint16_t Index, llvm::Twine ErrMsg);
+ SectionBase *getSection(uint16_t Index, const llvm::Twine &ErrMsg);
template <class T>
- T *getSectionOfType(uint16_t Index, llvm::Twine IndexErrMsg,
- llvm::Twine TypeErrMsg);
+ T *getSectionOfType(uint16_t Index, const llvm::Twine &IndexErrMsg,
+ const llvm::Twine &TypeErrMsg);
};
class SectionBase {
namespace llvm {
-LLVM_ATTRIBUTE_NORETURN void error(Twine Message) {
+LLVM_ATTRIBUTE_NORETURN void error(const Twine &Message) {
errs() << ToolName << ": " << Message << ".\n";
errs().flush();
exit(1);
namespace llvm {
-LLVM_ATTRIBUTE_NORETURN extern void error(Twine Message);
+LLVM_ATTRIBUTE_NORETURN extern void error(const Twine &Message);
// This is taken from llvm-readobj.
// [see here](llvm/tools/llvm-readobj/llvm-readobj.h:38)
repr(Twine("a").concat(Twine(SmallString<3>("b")).concat(Twine("c")))));
}
+TEST(TwineTest, Operators) {
+ EXPECT_EQ(R"((Twine cstring:"a" stringref:"b"))", repr("a" + StringRef("b")));
+
+ EXPECT_EQ(R"((Twine stringref:"a" cstring:"b"))", repr(StringRef("a") + "b"));
+ EXPECT_EQ(R"((Twine stringref:"a" stringref:"b"))",
+ repr(StringRef("a") + StringRef("b")));
+}
+
TEST(TwineTest, toNullTerminatedStringRef) {
SmallString<8> storage;
EXPECT_EQ(0, *Twine("hello").toNullTerminatedStringRef(storage).end());
/// to the class.
static void visitRegisterBankClasses(
CodeGenRegBank &RegisterClassHierarchy, const CodeGenRegisterClass *RC,
- const Twine Kind,
+ const Twine &Kind,
std::function<void(const CodeGenRegisterClass *, StringRef)> VisitFn,
SmallPtrSetImpl<const CodeGenRegisterClass *> &VisitedRCs) {
for (const auto &PossibleSubclass : RegisterClassHierarchy.getRegClasses()) {
std::string TmpKind =
- (Twine(Kind) + " (" + PossibleSubclass.getName() + ")").str();
+ (Kind + " (" + PossibleSubclass.getName() + ")").str();
// Visit each subclass of an explicitly named class.
if (RC != &PossibleSubclass && RC->hasSubClass(&PossibleSubclass))