Add support for storage type to base::Flags.

Also drop the DEFINE_FLAGS() macro, and use the typedef explicitly.

TEST=base-unittests
R=svenpanne@chromium.org

Review URL: https://codereview.chromium.org/527173002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@23578 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/base/flags-unittest.cc

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "include/v8stdint.h"
 #include "src/base/flags.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -16,7 +17,7 @@ enum Flag1 {
   kFlag1Second = 1u << 2,
   kFlag1All = kFlag1None | kFlag1First | kFlag1Second
 };
-DEFINE_FLAGS(Flags1, Flag1);
+typedef Flags<Flag1> Flags1;
 
 
 DEFINE_OPERATORS_FOR_FLAGS(Flags1)
@@ -60,7 +61,7 @@ enum Option {
   kOption2 = 2,
   kAllOptions = kNoOptions | kOption1 | kOption2
 };
-DEFINE_FLAGS(Options, Option);
+typedef Flags<Option> Options;
 
 }  // namespace foo
 
@@ -82,7 +83,7 @@ namespace {
 
 struct Foo {
   enum Enum { kEnum1 = 1, kEnum2 = 2 };
-  DEFINE_FLAGS(Enums, Enum);
+  typedef Flags<Enum, uint32_t> Enums;
 };
 
 

src/base/flags.h

@@ -11,18 +11,19 @@ namespace v8 {
 namespace base {
 
 // The Flags class provides a type-safe way of storing OR-combinations of enum
-// values. The Flags<T> class is a template class, where T is an enum type.
+// values. The Flags<T, S> class is a template class, where T is an enum type,
+// and S is the underlying storage type (usually int).
 //
 // The traditional C++ approach for storing OR-combinations of enum values is to
 // use an int or unsigned int variable. The inconvenience with this approach is
 // that there's no type checking at all; any enum value can be OR'd with any
 // other enum value and passed on to a function that takes an int or unsigned
 // int.
-template <typename T>
+template <typename T, typename S = int>
 class Flags V8_FINAL {
  public:
   typedef T flag_type;
-  typedef int mask_type;
+  typedef S mask_type;
 
   Flags() : mask_(0) {}
   Flags(flag_type flag) : mask_(flag) {}  // NOLINT(runtime/explicit)
@@ -63,8 +64,6 @@ class Flags V8_FINAL {
 };
 
 
-#define DEFINE_FLAGS(Type, Enum) typedef ::v8::base::Flags<Enum> Type
-
 #define DEFINE_OPERATORS_FOR_FLAGS(Type)                                       \
   inline ::v8::base::Flags<Type::flag_type> operator&(                         \
       Type::flag_type lhs,                                                     \

src/compiler/linkage.h

@@ -50,7 +50,7 @@ class CallDescriptor V8_FINAL : public ZoneObject {
     kNeedsNopAfterCall = 1u << 2,
     kPatchableCallSiteWithNop = kPatchableCallSite | kNeedsNopAfterCall
   };
-  DEFINE_FLAGS(Flags, Flag);
+  typedef base::Flags<Flag> Flags;
 
   CallDescriptor(Kind kind, int8_t return_count, int16_t parameter_count,
                  int16_t input_count, LinkageLocation* locations,