//
//===----------------------------------------------------------------------===//
//
-// This file defines the very important Value class. This is subclassed by a
-// bunch of other important classes, like Instruction, Function, Type, etc...
-//
+// This file declares the Value class.
// This file also defines the Use<> template for users of value.
//
//===----------------------------------------------------------------------===//
#include "llvm/AbstractTypeUser.h"
#include "llvm/Use.h"
#include "llvm/Support/Casting.h"
+#include "llvm/Support/Streams.h"
#include <string>
namespace llvm {
class GlobalValue;
class Function;
class GlobalVariable;
+class InlineAsm;
class SymbolTable;
//===----------------------------------------------------------------------===//
// Value Class
//===----------------------------------------------------------------------===//
-/// Value - The base class of all values computed by a program that may be used
-/// as operands to other values.
+/// 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
+/// automatically update's the module's symbol table.
///
+/// Every value has a "use list" that keeps track of which other Values are
+/// using this Value.
+/// @brief LLVM Value Representation
class Value {
unsigned short SubclassID; // Subclass identifier (for isa/dyn_cast)
protected:
PATypeHolder Ty;
Use *UseList;
- friend class SymbolTable; // Allow SymbolTable to directly poke Name.
+ friend class ValueSymbolTable; // Allow ValueSymbolTable to directly mod Name.
+ friend class SymbolTable; // Allow SymbolTable to directly poke Name.
std::string Name;
void operator=(const Value &); // Do not implement
/// print - Implement operator<< on Value...
///
virtual void print(std::ostream &O) const = 0;
+ void print(std::ostream *O) const { if (O) print(*O); }
/// All values are typed, get the type of this value.
///
///
void addUse(Use &U) { U.addToList(&UseList); }
- /// getValueType - Return an ID for the concrete type of this object. This is
- /// used to implement the classof checks. This should not be used for any
- /// other purpose, as the values may change as LLVM evolves. Also, note that
- /// starting with the InstructionVal value, the value stored is actually the
- /// Instruction opcode, so there are more than just these values possible here
- /// (and Instruction must be last).
- ///
+ /// An enumeration for keeping track of the concrete subclass of Value that
+ /// is actually instantiated. Values of this enumeration are kept in the
+ /// Value classes SubclassID field. They are used for concrete type
+ /// identification.
enum ValueTy {
ArgumentVal, // This is an instance of Argument
BasicBlockVal, // This is an instance of BasicBlock
ConstantExprVal, // This is an instance of ConstantExpr
ConstantAggregateZeroVal, // This is an instance of ConstantAggregateNull
ConstantBoolVal, // This is an instance of ConstantBool
- ConstantSIntVal, // This is an instance of ConstantSInt
- ConstantUIntVal, // This is an instance of ConstantUInt
+ 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
ConstantPackedVal, // This is an instance of ConstantPacked
ConstantPointerNullVal, // This is an instance of ConstantPointerNull
+ InlineAsmVal, // This is an instance of InlineAsm
InstructionVal, // This is an instance of Instruction
// Markers:
ConstantFirstVal = FunctionVal,
ConstantLastVal = ConstantPointerNullVal
};
+
+ /// getValueType - Return an ID for the concrete type of this object. This is
+ /// used to implement the classof checks. This should not be used for any
+ /// other purpose, as the values may change as LLVM evolves. Also, note that
+ /// starting with the InstructionVal value, the value stored is actually the
+ /// Instruction opcode, so there are more than just these values possible here
+ /// (and Instruction must be last).
+ ///
unsigned getValueType() const {
return SubclassID;
}
// Methods for support type inquiry through isa, cast, and dyn_cast:
- static inline bool classof(const Value *V) {
+ static inline bool classof(const Value *) {
return true; // Values are always values.
}
private:
/// FIXME: this is a gross hack, needed by another gross hack. Eliminate!
- void setValueType(unsigned VT) { SubclassID = VT; }
+ void setValueType(unsigned short VT) { SubclassID = VT; }
friend class Instruction;
};
template <> inline bool isa_impl<Argument, Value>(const Value &Val) {
return Val.getValueType() == Value::ArgumentVal;
}
+template <> inline bool isa_impl<InlineAsm, Value>(const Value &Val) {
+ return Val.getValueType() == Value::InlineAsmVal;
+}
template <> inline bool isa_impl<Instruction, Value>(const Value &Val) {
return Val.getValueType() >= Value::InstructionVal;
}
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