turnidge@google.com
40b0d11c1f
Review URL: https://chromiumcodereview.appspot.com//10829127 git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart@10133 260f80e4-7a28-3924-810f-c04153c831b5
76 lines
2.6 KiB
C++
76 lines
2.6 KiB
C++
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_GLOBALS_H_
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#define VM_GLOBALS_H_
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// This file contains global definitions for the VM library only. Anything that
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// is more globally useful should be added to 'vm/globals.h'.
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#include "platform/globals.h"
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#if defined(_WIN32)
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// Undef conflicting defines.
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#undef PARITY_EVEN
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#undef PARITY_ODD
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#undef near
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#endif
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// The following #defines are invalidated.
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#undef OVERFLOW // From math.h conflicts in constants_ia32.h
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namespace dart {
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// Smi value range is from -(2^N) to (2^N)-1.
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// N=30 (32-bit build) or N=62 (64-bit build).
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const intptr_t kSmiBits = kBitsPerWord - 2;
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const intptr_t kSmiMax = (static_cast<intptr_t>(1) << kSmiBits) - 1;
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const intptr_t kSmiMin = -(static_cast<intptr_t>(1) << kSmiBits);
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// The expression ARRAY_SIZE(array) is a compile-time constant of type
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// size_t which represents the number of elements of the given
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// array. You should only use ARRAY_SIZE on statically allocated
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// arrays.
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#define ARRAY_SIZE(array) \
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((sizeof(array) / sizeof(*(array))) / \
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static_cast<intptr_t>(!(sizeof(array) % sizeof(*(array)))))
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// The expression OFFSET_OF(type, field) computes the byte-offset of
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// the specified field relative to the containing type.
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//
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// The expression OFFSET_OF_RETURNED_VALUE(type, accessor) computes the
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// byte-offset of the return value of the accessor to the containing type.
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//
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// None of these use 0 or NULL, which causes a problem with the compiler
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// warnings we have enabled (which is also why 'offsetof' doesn't seem to work).
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// The workaround is to use the non-zero value kOffsetOfPtr.
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const intptr_t kOffsetOfPtr = 32;
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#define OFFSET_OF(type, field) \
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(reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(kOffsetOfPtr)->field)) \
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- kOffsetOfPtr)
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#define OFFSET_OF_RETURNED_VALUE(type, accessor) \
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(reinterpret_cast<intptr_t>( \
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(reinterpret_cast<type*>(kOffsetOfPtr)->accessor())) - kOffsetOfPtr)
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// A type large enough to contain the value of the C++ vtable. This is needed
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// to support the handle operations.
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typedef uword cpp_vtable;
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// When using GCC we can use GCC attributes to ensure that certain
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// contants are 16 byte aligned.
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#if defined(TARGET_OS_WINDOWS)
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#define ALIGN16 __declspec(align(16))
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#else
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#define ALIGN16 __attribute__((aligned(16)))
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#endif
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} // namespace dart
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#endif // VM_GLOBALS_H_
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