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Add a new slew of functions to allow dynamic_cast<> like operation for

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upcasting Value's to their subclasses.

llvm-svn: 80
This commit is contained in:
Chris Lattner 2001-06-27 23:27:42 +00:00
parent b2d6da7f1e
commit 159093b8fe
1 changed files with 59 additions and 1 deletions
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60
include/llvm/Value.h
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@ -13,6 +13,12 @@
class User;
class Type;
class ConstPoolVal;
class MethodArgument;
class Instruction;
class BasicBlock;
class Method;
class Module;
template<class ValueSubclass, class ItemParentType> class ValueHolder;
//===----------------------------------------------------------------------===//
@ -46,12 +52,64 @@ public:
virtual ~Value();
inline const Type *getType() const { return Ty; }
inline ValueTy getValueType() const { return VTy; }
// All values can potentially be named...
inline bool hasName() const { return Name != ""; }
inline const string &getName() const { return Name; }
virtual void setName(const string &name) { Name = name; }
// Methods for determining the subtype of this Value. The getValueType()
// method returns the type of the value directly. The cast*() methods are
// equilivent to using dynamic_cast<>... if the cast is successful, this is
// returned, otherwise you get a null pointer, allowing expressions like this:
//
// if (Instruction *I = Val->castInstruction()) { ... }
//
// This section also defines a family of isType, isConstant, isMethodArgument,
// etc functions...
//
// The family of functions Val->cast<type>Asserting() is used in the same
// way as the Val->cast<type>() instructions, but they assert the expected
// type instead of checking it at runtime.
//
inline ValueTy getValueType() const { return VTy; }
// Use a macro to define the functions, otherwise these definitions are just
// really long and ugly.
#define CAST_FN(NAME, CLASS) \
inline bool is##NAME() const { return VTy == NAME##Val; } \
inline const CLASS *cast##NAME() const { /*const version */ \
return is##NAME() ? (const CLASS*)this : 0; \
} \
inline CLASS *cast##NAME() { /* nonconst version */ \
return is##NAME() ? (CLASS*)this : 0; \
} \
inline const CLASS *cast##NAME##Asserting() const { /*const version */ \
assert(is##NAME() && "Expected Value Type: " #NAME); \
return (const CLASS*)this; \
} \
inline CLASS *cast##NAME##Asserting() { /* nonconst version */ \
assert(is##NAME() && "Expected Value Type: " #NAME); \
return (CLASS*)this; \
} \
CAST_FN(Constant , ConstPoolVal )
CAST_FN(MethodArgument, MethodArgument)
CAST_FN(Instruction , Instruction )
CAST_FN(BasicBlock , BasicBlock )
CAST_FN(Method , Method )
CAST_FN(Module , Module )
#undef CAST_FN
// Type value is special, because there is no nonconst version of functions!
inline bool isType() const { return VTy == TypeVal; }
inline const Type *castType() const {
return (VTy == TypeVal) ? (const Type*)this : 0;
}
inline const Type *castTypeAsserting() const {
assert(isType() && "Expected Value Type: Type");
return (const Type*)this;
}
// replaceAllUsesWith - Go through the uses list for this definition and make
// each use point to "D" instead of "this". After this completes, 'this's