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authorChris Lattner <sabre@nondot.org>2002-04-08 21:43:56 +0000
committerChris Lattner <sabre@nondot.org>2002-04-08 21:43:56 +0000
commit589df88ba03a81b2b3dc9d084c191a3a74724ecd (patch)
tree82fbdd88c5353d3b15e8dac47de92ea986723aa6 /include
parent968ddc921e70d098923a6dc585f86b6ebc3fd13e (diff)
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Pull casting operators out of Value.h
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@2166 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'include')
-rw-r--r--include/Support/Casting.h80
-rw-r--r--include/llvm/Support/Casting.h80
2 files changed, 160 insertions, 0 deletions
diff --git a/include/Support/Casting.h b/include/Support/Casting.h
new file mode 100644
index 0000000..e59b7c2
--- /dev/null
+++ b/include/Support/Casting.h
@@ -0,0 +1,80 @@
+//===-- Support/Casting.h - Allow flexible, checked, casts -------*- C++ -*--=//
+//
+// This file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(),
+// and dyn_cast_or_null<X>() templates.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUPPORT_CASTING_H
+#define SUPPORT_CASTING_H
+
+// real_type - Provide a macro to get the real type of a value that might be
+// a use. This provides a typedef 'Type' that is the argument type for all
+// non UseTy types, and is the contained pointer type of the use if it is a
+// UseTy.
+//
+template <class X> class real_type { typedef X Type; };
+
+//===----------------------------------------------------------------------===//
+// Type Checking Templates
+//===----------------------------------------------------------------------===//
+
+// isa<X> - Return true if the parameter to the template is an instance of the
+// template type argument. Used like this:
+//
+// if (isa<Type>(myVal)) { ... }
+//
+template <class X, class Y>
+inline bool isa(Y Val) {
+ assert(Val && "isa<Ty>(NULL) invoked!");
+ return X::classof(Val);
+}
+
+
+// cast<X> - Return the argument parameter cast to the specified type. This
+// casting operator asserts that the type is correct, so it does not return null
+// on failure. But it will correctly return NULL when the input is NULL.
+// Used Like this:
+//
+// cast< Instruction>(myVal)->getParent()
+// cast<const Instruction>(myVal)->getParent()
+//
+template <class X, class Y>
+inline X *cast(Y Val) {
+ assert(isa<X>(Val) && "cast<Ty>() argument of uncompatible type!");
+ return (X*)(real_type<Y>::Type)Val;
+}
+
+// cast_or_null<X> - Functionally identical to cast, except that a null value is
+// accepted.
+//
+template <class X, class Y>
+inline X *cast_or_null(Y Val) {
+ assert((Val == 0 || isa<X>(Val)) &&
+ "cast_or_null<Ty>() argument of uncompatible type!");
+ return (X*)(real_type<Y>::Type)Val;
+}
+
+
+// dyn_cast<X> - Return the argument parameter cast to the specified type. This
+// casting operator returns null if the argument is of the wrong type, so it can
+// be used to test for a type as well as cast if successful. This should be
+// used in the context of an if statement like this:
+//
+// if (const Instruction *I = dyn_cast<const Instruction>(myVal)) { ... }
+//
+
+template <class X, class Y>
+inline X *dyn_cast(Y Val) {
+ return isa<X>(Val) ? cast<X>(Val) : 0;
+}
+
+// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null
+// value is accepted.
+//
+template <class X, class Y>
+inline X *dyn_cast_or_null(Y Val) {
+ return (Val && isa<X>(Val)) ? cast<X>(Val) : 0;
+}
+
+#endif
diff --git a/include/llvm/Support/Casting.h b/include/llvm/Support/Casting.h
new file mode 100644
index 0000000..e59b7c2
--- /dev/null
+++ b/include/llvm/Support/Casting.h
@@ -0,0 +1,80 @@
+//===-- Support/Casting.h - Allow flexible, checked, casts -------*- C++ -*--=//
+//
+// This file defines the isa<X>(), cast<X>(), dyn_cast<X>(), cast_or_null<X>(),
+// and dyn_cast_or_null<X>() templates.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef SUPPORT_CASTING_H
+#define SUPPORT_CASTING_H
+
+// real_type - Provide a macro to get the real type of a value that might be
+// a use. This provides a typedef 'Type' that is the argument type for all
+// non UseTy types, and is the contained pointer type of the use if it is a
+// UseTy.
+//
+template <class X> class real_type { typedef X Type; };
+
+//===----------------------------------------------------------------------===//
+// Type Checking Templates
+//===----------------------------------------------------------------------===//
+
+// isa<X> - Return true if the parameter to the template is an instance of the
+// template type argument. Used like this:
+//
+// if (isa<Type>(myVal)) { ... }
+//
+template <class X, class Y>
+inline bool isa(Y Val) {
+ assert(Val && "isa<Ty>(NULL) invoked!");
+ return X::classof(Val);
+}
+
+
+// cast<X> - Return the argument parameter cast to the specified type. This
+// casting operator asserts that the type is correct, so it does not return null
+// on failure. But it will correctly return NULL when the input is NULL.
+// Used Like this:
+//
+// cast< Instruction>(myVal)->getParent()
+// cast<const Instruction>(myVal)->getParent()
+//
+template <class X, class Y>
+inline X *cast(Y Val) {
+ assert(isa<X>(Val) && "cast<Ty>() argument of uncompatible type!");
+ return (X*)(real_type<Y>::Type)Val;
+}
+
+// cast_or_null<X> - Functionally identical to cast, except that a null value is
+// accepted.
+//
+template <class X, class Y>
+inline X *cast_or_null(Y Val) {
+ assert((Val == 0 || isa<X>(Val)) &&
+ "cast_or_null<Ty>() argument of uncompatible type!");
+ return (X*)(real_type<Y>::Type)Val;
+}
+
+
+// dyn_cast<X> - Return the argument parameter cast to the specified type. This
+// casting operator returns null if the argument is of the wrong type, so it can
+// be used to test for a type as well as cast if successful. This should be
+// used in the context of an if statement like this:
+//
+// if (const Instruction *I = dyn_cast<const Instruction>(myVal)) { ... }
+//
+
+template <class X, class Y>
+inline X *dyn_cast(Y Val) {
+ return isa<X>(Val) ? cast<X>(Val) : 0;
+}
+
+// dyn_cast_or_null<X> - Functionally identical to dyn_cast, except that a null
+// value is accepted.
+//
+template <class X, class Y>
+inline X *dyn_cast_or_null(Y Val) {
+ return (Val && isa<X>(Val)) ? cast<X>(Val) : 0;
+}
+
+#endif