blob: dc7932ed2c157f7128d6f5deb6695595fb0dea16 [file] [log] [blame]
// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#ifndef VM_GLOBALS_H_
#define VM_GLOBALS_H_
// This file contains global definitions for the VM library only. Anything that
// is more globally useful should be added to 'vm/globals.h'.
#include "platform/globals.h"
#if defined(_WIN32)
// Undef conflicting defines.
#undef near
// The following #defines are invalidated.
#undef OVERFLOW // From math.h conflicts in constants_ia32.h
namespace dart {
// Smi value range is from -(2^N) to (2^N)-1.
// N=30 (32-bit build) or N=62 (64-bit build).
const intptr_t kSmiBits = kBitsPerWord - 2;
const intptr_t kSmiMax = (static_cast<intptr_t>(1) << kSmiBits) - 1;
const intptr_t kSmiMin = -(static_cast<intptr_t>(1) << kSmiBits);
const double kPosInfinity = bit_cast<double>(DART_UINT64_C(0x7ff0000000000000));
const double kNegInfinity = bit_cast<double>(DART_UINT64_C(0xfff0000000000000));
// The expression ARRAY_SIZE(array) is a compile-time constant of type
// size_t which represents the number of elements of the given
// array. You should only use ARRAY_SIZE on statically allocated
// arrays.
#define ARRAY_SIZE(array) \
((sizeof(array) / sizeof(*(array))) / \
static_cast<intptr_t>(!(sizeof(array) % sizeof(*(array)))))
// The expression OFFSET_OF(type, field) computes the byte-offset of
// the specified field relative to the containing type.
// The expression OFFSET_OF_RETURNED_VALUE(type, accessor) computes the
// byte-offset of the return value of the accessor to the containing type.
// None of these use 0 or NULL, which causes a problem with the compiler
// warnings we have enabled (which is also why 'offsetof' doesn't seem to work).
// The workaround is to use the non-zero value kOffsetOfPtr.
const intptr_t kOffsetOfPtr = 32;
#define OFFSET_OF(type, field) \
(reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(kOffsetOfPtr)->field)) \
- kOffsetOfPtr)
#define OFFSET_OF_RETURNED_VALUE(type, accessor) \
(reinterpret_cast<intptr_t>( \
(reinterpret_cast<type*>(kOffsetOfPtr)->accessor())) - kOffsetOfPtr)
#define OPEN_ARRAY_START(type, align) \
do { \
const uword result = reinterpret_cast<uword>(this) + sizeof(*this); \
ASSERT(Utils::IsAligned(result, sizeof(align))); \
return reinterpret_cast<type*>(result); \
} while (0)
// A type large enough to contain the value of the C++ vtable. This is needed
// to support the handle operations.
typedef uword cpp_vtable;
// When using GCC we can use GCC attributes to ensure that certain
// contants are 8 or 16 byte aligned.
#if defined(TARGET_OS_WINDOWS)
#define ALIGN8 __declspec(align(8))
#define ALIGN16 __declspec(align(16))
#define ALIGN8 __attribute__((aligned(8)))
#define ALIGN16 __attribute__((aligned(16)))
// Zap value used to indicate uninitialized handle area (debug purposes).
#if defined(ARCH_IS_32_BIT)
static const uword kZapUninitializedWord = 0xabababab;
static const uword kZapUninitializedWord = 0xabababababababab;
// Macros to get the contents of the fp register.
#if defined(TARGET_OS_WINDOWS)
#if defined(HOST_ARCH_IA32)
#define COPY_FP_REGISTER(fp) __asm { mov fp, ebp }; // NOLINT
#elif defined(HOST_ARCH_X64)
#error Unknown host architecture.
#else // !defined(TARGET_OS_WINDOWS))
// Assume GCC-like inline syntax is valid.
#if defined(HOST_ARCH_IA32)
#define COPY_FP_REGISTER(fp) asm volatile ("movl %%ebp, %0" : "=r" (fp) );
#elif defined(HOST_ARCH_X64)
#define COPY_FP_REGISTER(fp) asm volatile ("movq %%rbp, %0" : "=r" (fp) );
#elif defined(HOST_ARCH_ARM)
#define COPY_FP_REGISTER(fp) asm volatile ("mov %0, r11" : "=r" (fp) );
#elif defined(HOST_ARCH_ARM64)
#define COPY_FP_REGISTER(fp) asm volatile ("mov %0, x29" : "=r" (fp) );
#elif defined(HOST_ARCH_MIPS)
#define COPY_FP_REGISTER(fp) asm volatile ("move %0, $fp" : "=r" (fp) );
#error Unknown host architecture.
#endif // !defined(TARGET_OS_WINDOWS))
} // namespace dart
#endif // VM_GLOBALS_H_