From: Ken Dyck <ken.dyck@onsemi.com>
Date: Fri, 18 Dec 2009 13:39:46 +0000 (+0000)
Subject: Initial implementation of CharUnits, an opaque value class for representing
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=64437137888d69b8ef03f3057524e5056e7d9dd6;p=clang

Initial implementation of CharUnits, an opaque value class for representing
sizes, offsets, and alignments in character units.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@91683 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/include/clang/AST/CharUnits.h b/include/clang/AST/CharUnits.h
new file mode 100644
index 0000000000..fee33d99ad
--- /dev/null
+++ b/include/clang/AST/CharUnits.h
@@ -0,0 +1,141 @@
+//===--- CharUnits.h - Character units for sizes and offsets ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//  This file defines the CharUnits class
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_CLANG_AST_CHARUNITS_H
+#define LLVM_CLANG_AST_CHARUNITS_H
+
+#include "llvm/ADT/StringExtras.h"
+
+#include <stdint.h>
+#include <string>
+
+namespace clang {
+  // An opaque type for sizes expressed in character units 
+  class CharUnits {
+    public:
+      typedef int64_t RawType;
+
+    private:
+      RawType Quantity;
+
+      explicit CharUnits(RawType C) : Quantity(C) {}
+
+    public:
+
+      /// A default constructor
+      CharUnits() : Quantity(0) {}
+
+      /// Zero - Construct a CharUnits quantity of zero
+      static CharUnits Zero() {
+        return CharUnits(0);
+      }
+
+      /// One - Construct a CharUnits quantity of one
+      static CharUnits One() {
+        return CharUnits(1);
+      }
+
+      /// fromRaw - Construct a CharUnits quantity from a raw integer type.
+      static CharUnits fromRaw(RawType Quantity) {
+        return CharUnits(Quantity); 
+      }
+
+      // compound assignment
+      CharUnits& operator+= (const CharUnits &Other) {
+        Quantity += Other.Quantity;
+        return *this;
+      }
+      CharUnits& operator-= (const CharUnits &Other) {
+        Quantity -= Other.Quantity;
+        return *this;
+      }
+       
+      // comparison operators
+      bool operator== (const CharUnits &Other) const {
+        return Quantity == Other.Quantity;
+      }
+      bool operator!= (const CharUnits &Other) const {
+        return Quantity != Other.Quantity;
+      }
+
+      // relational operators
+      bool operator<  (const CharUnits &Other) const { 
+        return Quantity <  Other.Quantity; 
+      }
+      bool operator<= (const CharUnits &Other) const { 
+        return Quantity <= Other.Quantity;
+      }
+      bool operator>  (const CharUnits &Other) const { 
+        return Quantity >  Other.Quantity; 
+      }
+      bool operator>= (const CharUnits &Other) const { 
+        return Quantity >= Other.Quantity; 
+      }
+
+      // other predicates
+      
+      /// isZero - Test whether the quantity equals zero.
+      bool isZero() const     { return Quantity == 0; }
+
+      /// isOne - Test whether the quantity equals one.
+      bool isOne() const      { return Quantity == 1; }
+
+      /// isPositive - Test whether the quanity is greater than zero.
+      bool isPositive() const { return Quantity  > 0; }
+
+      /// isNegative - Test whether the quantity is less than zero.
+      bool isNegative() const { return Quantity  < 0; }
+
+      // arithmetic operators
+      CharUnits operator* (RawType N) const {
+        return CharUnits(Quantity * N);
+      }
+      CharUnits operator/ (RawType N) const {
+        return CharUnits(Quantity / N);
+      }
+      RawType operator/ (const CharUnits &Other) const {
+        return Quantity / Other.Quantity;
+      }
+      CharUnits operator% (RawType N) const {
+        return CharUnits(Quantity % N);
+      }
+      RawType operator% (const CharUnits &Other) const {
+        return Quantity % Other.Quantity;
+      }
+      CharUnits operator+ (const CharUnits &Other) const {
+        return CharUnits(Quantity + Other.Quantity);
+      }
+      CharUnits operator- (const CharUnits &Other) const {
+        return CharUnits(Quantity - Other.Quantity);
+      }
+      
+      // conversions
+
+      /// toString - Convert to a string.
+      std::string toString() const {
+        return llvm::itostr(Quantity);
+      }
+
+      /// getRaw - Get the raw integer representation of this quantity.
+      RawType getRaw() const { return Quantity; }
+
+
+  }; // class CharUnit
+} // namespace clang
+
+inline clang::CharUnits operator* (clang::CharUnits::RawType Scale, 
+                                   const clang::CharUnits &CU) {
+  return CU * Scale;
+}
+
+#endif // LLVM_CLANG_AST_CHARUNITS_H