#ifndef LLVM_VALUE_H
#define LLVM_VALUE_H
-#include "llvm/AbstractTypeUser.h"
#include "llvm/Use.h"
+#include "llvm/ADT/StringRef.h"
#include "llvm/Support/Casting.h"
-#include <iosfwd>
#include <string>
namespace llvm {
class GlobalAlias;
class InlineAsm;
class ValueSymbolTable;
-class TypeSymbolTable;
template<typename ValueTy> class StringMapEntry;
+template <typename ValueTy = Value>
+class AssertingVH;
typedef StringMapEntry<Value*> ValueName;
class raw_ostream;
class AssemblyAnnotationWriter;
+class ValueHandleBase;
+class LLVMContext;
+class Twine;
+class MDNode;
+class Type;
//===----------------------------------------------------------------------===//
// Value Class
/// This is a very important LLVM class. It is the base class of all values
/// computed by a program that may be used as operands to other values. Value is
/// the super class of other important classes such as Instruction and Function.
-/// All Values have a Type. Type is not a subclass of Value. All types can have
-/// a name and they should belong to some Module. Setting the name on the Value
+/// All Values have a Type. Type is not a subclass of Value. Some values can
+/// have a name and they belong to some Module. Setting the name on the Value
/// automatically updates the module's symbol table.
///
/// Every value has a "use list" that keeps track of which other Values are
-/// using this Value.
+/// using this Value. A Value can also have an arbitrary number of ValueHandle
+/// objects that watch it and listen to RAUW and Destroy events. See
+/// llvm/Support/ValueHandle.h for details.
+///
/// @brief LLVM Value Representation
class Value {
- const unsigned short SubclassID; // Subclass identifier (for isa/dyn_cast)
+ const unsigned char SubclassID; // Subclass identifier (for isa/dyn_cast)
+ unsigned char HasValueHandle : 1; // Has a ValueHandle pointing to this?
protected:
+ /// SubclassOptionalData - This member is similar to SubclassData, however it
+ /// is for holding information which may be used to aid optimization, but
+ /// which may be cleared to zero without affecting conservative
+ /// interpretation.
+ unsigned char SubclassOptionalData : 7;
+
+private:
/// SubclassData - This member is defined by this class, but is not used for
/// anything. Subclasses can use it to hold whatever state they find useful.
/// This field is initialized to zero by the ctor.
unsigned short SubclassData;
-private:
- PATypeHolder VTy;
+
+ Type *VTy;
Use *UseList;
friend class ValueSymbolTable; // Allow ValueSymbolTable to directly mod Name.
- friend class SymbolTable; // Allow SymbolTable to directly poke Name.
+ friend class ValueHandleBase;
ValueName *Name;
void operator=(const Value &); // Do not implement
Value(const Value &); // Do not implement
-public:
+protected:
+ /// printCustom - Value subclasses can override this to implement custom
+ /// printing behavior.
+ virtual void printCustom(raw_ostream &O) const;
+
Value(const Type *Ty, unsigned scid);
+public:
virtual ~Value();
/// dump - Support for debugging, callable in GDB: V->dump()
//
- virtual void dump() const;
+ void dump() const;
/// print - Implement operator<< on Value.
///
- void print(std::ostream &O, AssemblyAnnotationWriter *AAW = 0) const;
void print(raw_ostream &O, AssemblyAnnotationWriter *AAW = 0) const;
/// All values are typed, get the type of this value.
///
- inline const Type *getType() const { return VTy; }
+ Type *getType() const { return VTy; }
+
+ /// All values hold a context through their type.
+ LLVMContext &getContext() const;
// All values can potentially be named...
- inline bool hasName() const { return Name != 0; }
+ bool hasName() const { return Name != 0; }
ValueName *getValueName() const { return Name; }
-
- /// getNameStart - Return a pointer to a null terminated string for this name.
- /// Note that names can have null characters within the string as well as at
- /// their end. This always returns a non-null pointer.
- const char *getNameStart() const;
- /// getNameEnd - Return a pointer to the end of the name.
- const char *getNameEnd() const { return getNameStart() + getNameLen(); }
- /// isName - Return true if this value has the name specified by the provided
- /// nul terminated string.
- bool isName(const char *N) const;
-
- /// getNameLen - Return the length of the string, correctly handling nul
- /// characters embedded into them.
- unsigned getNameLen() const;
-
- /// getName()/getNameStr() - Return the name of the specified value,
- /// *constructing a string* to hold it. Because these are guaranteed to
- /// construct a string, they are very expensive and should be avoided.
- std::string getName() const { return getNameStr(); }
+ /// getName() - Return a constant reference to the value's name. This is cheap
+ /// and guaranteed to return the same reference as long as the value is not
+ /// modified.
+ ///
+ /// This is currently guaranteed to return a StringRef for which data() points
+ /// to a valid null terminated string. The use of StringRef.data() is
+ /// deprecated here, however, and clients should not rely on it. If such
+ /// behavior is needed, clients should use expensive getNameStr(), or switch
+ /// to an interface that does not depend on null termination.
+ StringRef getName() const;
+
+ /// getNameStr() - Return the name of the specified value, *constructing a
+ /// string* to hold it. This is guaranteed to construct a string and is very
+ /// expensive, clients should use getName() unless necessary.
std::string getNameStr() const;
-
- void setName(const std::string &name);
- void setName(const char *Name, unsigned NameLen);
- void setName(const char *Name); // Takes a null-terminated string.
+ /// setName() - Change the name of the value, choosing a new unique name if
+ /// the provided name is taken.
+ ///
+ /// \arg Name - The new name; or "" if the value's name should be removed.
+ void setName(const Twine &Name);
/// takeName - transfer the name from V to this value, setting V's name to
// Methods for handling the chain of uses of this Value.
//
typedef value_use_iterator<User> use_iterator;
- typedef value_use_iterator<const User> use_const_iterator;
+ typedef value_use_iterator<const User> const_use_iterator;
- bool use_empty() const { return Use::isNil(UseList); }
+ bool use_empty() const { return UseList == 0; }
use_iterator use_begin() { return use_iterator(UseList); }
- use_const_iterator use_begin() const { return use_const_iterator(UseList); }
+ const_use_iterator use_begin() const { return const_use_iterator(UseList); }
use_iterator use_end() { return use_iterator(0); }
- use_const_iterator use_end() const { return use_const_iterator(0); }
+ const_use_iterator use_end() const { return const_use_iterator(0); }
User *use_back() { return *use_begin(); }
const User *use_back() const { return *use_begin(); }
/// traversing the whole use list.
///
bool hasOneUse() const {
- use_const_iterator I = use_begin(), E = use_end();
+ const_use_iterator I = use_begin(), E = use_end();
if (I == E) return false;
return ++I == E;
}
///
bool hasNUsesOrMore(unsigned N) const;
- bool isUsedInBasicBlock(BasicBlock *BB) const;
+ bool isUsedInBasicBlock(const BasicBlock *BB) const;
/// getNumUses - This method computes the number of uses of this Value. This
/// is a linear time operation. Use hasOneUse, hasNUses, or hasMoreThanNUses
GlobalAliasVal, // This is an instance of GlobalAlias
GlobalVariableVal, // This is an instance of GlobalVariable
UndefValueVal, // This is an instance of UndefValue
+ BlockAddressVal, // This is an instance of BlockAddress
ConstantExprVal, // This is an instance of ConstantExpr
- ConstantAggregateZeroVal, // This is an instance of ConstantAggregateNull
+ ConstantAggregateZeroVal, // This is an instance of ConstantAggregateZero
ConstantIntVal, // This is an instance of ConstantInt
ConstantFPVal, // This is an instance of ConstantFP
ConstantArrayVal, // This is an instance of ConstantArray
ConstantStructVal, // This is an instance of ConstantStruct
ConstantVectorVal, // This is an instance of ConstantVector
ConstantPointerNullVal, // This is an instance of ConstantPointerNull
+ MDNodeVal, // This is an instance of MDNode
+ MDStringVal, // This is an instance of MDString
InlineAsmVal, // This is an instance of InlineAsm
PseudoSourceValueVal, // This is an instance of PseudoSourceValue
+ FixedStackPseudoSourceValueVal, // This is an instance of
+ // FixedStackPseudoSourceValue
InstructionVal, // This is an instance of Instruction
-
+ // Enum values starting at InstructionVal are used for Instructions;
+ // don't add new values here!
+
// Markers:
ConstantFirstVal = FunctionVal,
ConstantLastVal = ConstantPointerNullVal
return SubclassID;
}
+ /// getRawSubclassOptionalData - Return the raw optional flags value
+ /// contained in this value. This should only be used when testing two
+ /// Values for equivalence.
+ unsigned getRawSubclassOptionalData() const {
+ return SubclassOptionalData;
+ }
+
+ /// clearSubclassOptionalData - Clear the optional flags contained in
+ /// this value.
+ void clearSubclassOptionalData() {
+ SubclassOptionalData = 0;
+ }
+
+ /// hasSameSubclassOptionalData - Test whether the optional flags contained
+ /// in this value are equal to the optional flags in the given value.
+ bool hasSameSubclassOptionalData(const Value *V) const {
+ return SubclassOptionalData == V->SubclassOptionalData;
+ }
+
+ /// intersectOptionalDataWith - Clear any optional flags in this value
+ /// that are not also set in the given value.
+ void intersectOptionalDataWith(const Value *V) {
+ SubclassOptionalData &= V->SubclassOptionalData;
+ }
+
+ /// hasValueHandle - Return true if there is a value handle associated with
+ /// this value.
+ bool hasValueHandle() const { return HasValueHandle; }
+
// Methods for support type inquiry through isa, cast, and dyn_cast:
static inline bool classof(const Value *) {
return true; // Values are always values.
}
- /// getRawType - This should only be used to implement the vmcore library.
- ///
- const Type *getRawType() const { return VTy.getRawType(); }
-
/// stripPointerCasts - This method strips off any unneeded pointer
/// casts from the specified value, returning the original uncasted value.
- /// Note that the returned value is guaranteed to have pointer type.
+ /// Note that the returned value has pointer type if the specified value does.
Value *stripPointerCasts();
const Value *stripPointerCasts() const {
return const_cast<Value*>(this)->stripPointerCasts();
}
+
+ /// isDereferenceablePointer - Test if this value is always a pointer to
+ /// allocated and suitably aligned memory for a simple load or store.
+ bool isDereferenceablePointer() const;
+
+ /// DoPHITranslation - If this value is a PHI node with CurBB as its parent,
+ /// return the value in the PHI node corresponding to PredBB. If not, return
+ /// ourself. This is useful if you want to know the value something has in a
+ /// predecessor block.
+ Value *DoPHITranslation(const BasicBlock *CurBB, const BasicBlock *PredBB);
+
+ const Value *DoPHITranslation(const BasicBlock *CurBB,
+ const BasicBlock *PredBB) const{
+ return const_cast<Value*>(this)->DoPHITranslation(CurBB, PredBB);
+ }
+
+ /// MaximumAlignment - This is the greatest alignment value supported by
+ /// load, store, and alloca instructions, and global values.
+ static const unsigned MaximumAlignment = 1u << 29;
+
+ /// mutateType - Mutate the type of this Value to be of the specified type.
+ /// Note that this is an extremely dangerous operation which can create
+ /// completely invalid IR very easily. It is strongly recommended that you
+ /// recreate IR objects with the right types instead of mutating them in
+ /// place.
+ void mutateType(Type *Ty) {
+ VTy = Ty;
+ }
+
+protected:
+ unsigned short getSubclassDataFromValue() const { return SubclassData; }
+ void setValueSubclassData(unsigned short D) { SubclassData = D; }
};
-inline std::ostream &operator<<(std::ostream &OS, const Value &V) {
- V.print(OS);
- return OS;
-}
inline raw_ostream &operator<<(raw_ostream &OS, const Value &V) {
V.print(OS);
return OS;
}
-void Use::init(Value *V, User *) {
- Val1 = V;
- if (V) V->addUse(*this);
- else Next = nilUse(0);
-}
-
void Use::set(Value *V) {
- if (Val1) removeFromList();
- Val1 = V;
+ if (Val) removeFromList();
+ Val = V;
if (V) V->addUse(*this);
- else Next = nilUse(0);
}
// isa - Provide some specializations of isa so that we don't have to include
// the subtype header files to test to see if the value is a subclass...
//
-template <> inline bool isa_impl<Constant, Value>(const Value &Val) {
- return Val.getValueID() >= Value::ConstantFirstVal &&
- Val.getValueID() <= Value::ConstantLastVal;
-}
-template <> inline bool isa_impl<Argument, Value>(const Value &Val) {
- return Val.getValueID() == Value::ArgumentVal;
-}
-template <> inline bool isa_impl<InlineAsm, Value>(const Value &Val) {
- return Val.getValueID() == Value::InlineAsmVal;
-}
-template <> inline bool isa_impl<Instruction, Value>(const Value &Val) {
- return Val.getValueID() >= Value::InstructionVal;
-}
-template <> inline bool isa_impl<BasicBlock, Value>(const Value &Val) {
- return Val.getValueID() == Value::BasicBlockVal;
-}
-template <> inline bool isa_impl<Function, Value>(const Value &Val) {
- return Val.getValueID() == Value::FunctionVal;
-}
-template <> inline bool isa_impl<GlobalVariable, Value>(const Value &Val) {
- return Val.getValueID() == Value::GlobalVariableVal;
-}
-template <> inline bool isa_impl<GlobalAlias, Value>(const Value &Val) {
- return Val.getValueID() == Value::GlobalAliasVal;
-}
-template <> inline bool isa_impl<GlobalValue, Value>(const Value &Val) {
- return isa<GlobalVariable>(Val) || isa<Function>(Val) || isa<GlobalAlias>(Val);
-}
+template <> struct isa_impl<Constant, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() >= Value::ConstantFirstVal &&
+ Val.getValueID() <= Value::ConstantLastVal;
+ }
+};
+
+template <> struct isa_impl<Argument, Value> {
+ static inline bool doit (const Value &Val) {
+ return Val.getValueID() == Value::ArgumentVal;
+ }
+};
+
+template <> struct isa_impl<InlineAsm, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::InlineAsmVal;
+ }
+};
+
+template <> struct isa_impl<Instruction, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() >= Value::InstructionVal;
+ }
+};
+
+template <> struct isa_impl<BasicBlock, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::BasicBlockVal;
+ }
+};
+
+template <> struct isa_impl<Function, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::FunctionVal;
+ }
+};
+
+template <> struct isa_impl<GlobalVariable, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::GlobalVariableVal;
+ }
+};
+
+template <> struct isa_impl<GlobalAlias, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::GlobalAliasVal;
+ }
+};
+
+template <> struct isa_impl<GlobalValue, Value> {
+ static inline bool doit(const Value &Val) {
+ return isa<GlobalVariable>(Val) || isa<Function>(Val) ||
+ isa<GlobalAlias>(Val);
+ }
+};
+
+template <> struct isa_impl<MDNode, Value> {
+ static inline bool doit(const Value &Val) {
+ return Val.getValueID() == Value::MDNodeVal;
+ }
+};
+
+// Value* is only 4-byte aligned.
+template<>
+class PointerLikeTypeTraits<Value*> {
+ typedef Value* PT;
+public:
+ static inline void *getAsVoidPointer(PT P) { return P; }
+ static inline PT getFromVoidPointer(void *P) {
+ return static_cast<PT>(P);
+ }
+ enum { NumLowBitsAvailable = 2 };
+};
} // End llvm namespace
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