03cfc4363b
Review URL: https://chromiumcodereview.appspot.com/9600009 git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@11007 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
403 lines
15 KiB
C++
403 lines
15 KiB
C++
// Copyright 2012 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_GLOBALS_H_
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#define V8_GLOBALS_H_
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// Define V8_INFINITY
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#define V8_INFINITY INFINITY
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// GCC specific stuff
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#ifdef __GNUC__
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#define __GNUC_VERSION_FOR_INFTY__ (__GNUC__ * 10000 + __GNUC_MINOR__ * 100)
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// Unfortunately, the INFINITY macro cannot be used with the '-pedantic'
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// warning flag and certain versions of GCC due to a bug:
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// http://gcc.gnu.org/bugzilla/show_bug.cgi?id=11931
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// For now, we use the more involved template-based version from <limits>, but
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// only when compiling with GCC versions affected by the bug (2.96.x - 4.0.x)
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// __GNUC_PREREQ is not defined in GCC for Mac OS X, so we define our own macro
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#if __GNUC_VERSION_FOR_INFTY__ >= 29600 && __GNUC_VERSION_FOR_INFTY__ < 40100
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#include <limits>
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#undef V8_INFINITY
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#define V8_INFINITY std::numeric_limits<double>::infinity()
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#endif
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#undef __GNUC_VERSION_FOR_INFTY__
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#endif // __GNUC__
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#ifdef _MSC_VER
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#undef V8_INFINITY
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#define V8_INFINITY HUGE_VAL
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#endif
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#include "../include/v8stdint.h"
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namespace v8 {
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namespace internal {
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// Processor architecture detection. For more info on what's defined, see:
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// http://msdn.microsoft.com/en-us/library/b0084kay.aspx
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// http://www.agner.org/optimize/calling_conventions.pdf
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// or with gcc, run: "echo | gcc -E -dM -"
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#if defined(_M_X64) || defined(__x86_64__)
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#define V8_HOST_ARCH_X64 1
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#define V8_HOST_ARCH_64_BIT 1
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#define V8_HOST_CAN_READ_UNALIGNED 1
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#elif defined(_M_IX86) || defined(__i386__)
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#define V8_HOST_ARCH_IA32 1
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#define V8_HOST_ARCH_32_BIT 1
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#define V8_HOST_CAN_READ_UNALIGNED 1
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#elif defined(__ARMEL__)
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#define V8_HOST_ARCH_ARM 1
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#define V8_HOST_ARCH_32_BIT 1
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// Some CPU-OS combinations allow unaligned access on ARM. We assume
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// that unaligned accesses are not allowed unless the build system
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// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
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#if CAN_USE_UNALIGNED_ACCESSES
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#define V8_HOST_CAN_READ_UNALIGNED 1
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#endif
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#elif defined(__MIPSEL__)
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#define V8_HOST_ARCH_MIPS 1
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#define V8_HOST_ARCH_32_BIT 1
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#else
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#error Host architecture was not detected as supported by v8
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#endif
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// Target architecture detection. This may be set externally. If not, detect
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// in the same way as the host architecture, that is, target the native
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// environment as presented by the compiler.
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#if !defined(V8_TARGET_ARCH_X64) && !defined(V8_TARGET_ARCH_IA32) && \
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!defined(V8_TARGET_ARCH_ARM) && !defined(V8_TARGET_ARCH_MIPS)
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#if defined(_M_X64) || defined(__x86_64__)
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#define V8_TARGET_ARCH_X64 1
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#elif defined(_M_IX86) || defined(__i386__)
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#define V8_TARGET_ARCH_IA32 1
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#elif defined(__ARMEL__)
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#define V8_TARGET_ARCH_ARM 1
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#elif defined(__MIPSEL__)
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#define V8_TARGET_ARCH_MIPS 1
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#else
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#error Target architecture was not detected as supported by v8
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#endif
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#endif
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// Check for supported combinations of host and target architectures.
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#if defined(V8_TARGET_ARCH_IA32) && !defined(V8_HOST_ARCH_IA32)
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#error Target architecture ia32 is only supported on ia32 host
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#endif
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#if defined(V8_TARGET_ARCH_X64) && !defined(V8_HOST_ARCH_X64)
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#error Target architecture x64 is only supported on x64 host
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#endif
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#if (defined(V8_TARGET_ARCH_ARM) && \
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!(defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_ARM)))
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#error Target architecture arm is only supported on arm and ia32 host
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#endif
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#if (defined(V8_TARGET_ARCH_MIPS) && \
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!(defined(V8_HOST_ARCH_IA32) || defined(V8_HOST_ARCH_MIPS)))
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#error Target architecture mips is only supported on mips and ia32 host
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#endif
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// Determine whether we are running in a simulated environment.
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// Setting USE_SIMULATOR explicitly from the build script will force
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// the use of a simulated environment.
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#if !defined(USE_SIMULATOR)
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#if (defined(V8_TARGET_ARCH_ARM) && !defined(V8_HOST_ARCH_ARM))
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#define USE_SIMULATOR 1
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#endif
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#if (defined(V8_TARGET_ARCH_MIPS) && !defined(V8_HOST_ARCH_MIPS))
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#define USE_SIMULATOR 1
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#endif
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#endif
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// Define unaligned read for the target architectures supporting it.
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#if defined(V8_TARGET_ARCH_X64) || defined(V8_TARGET_ARCH_IA32)
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#define V8_TARGET_CAN_READ_UNALIGNED 1
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#elif V8_TARGET_ARCH_ARM
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// Some CPU-OS combinations allow unaligned access on ARM. We assume
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// that unaligned accesses are not allowed unless the build system
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// defines the CAN_USE_UNALIGNED_ACCESSES macro to be non-zero.
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#if CAN_USE_UNALIGNED_ACCESSES
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#define V8_TARGET_CAN_READ_UNALIGNED 1
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#endif
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#elif V8_TARGET_ARCH_MIPS
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#else
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#error Target architecture is not supported by v8
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#endif
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// Support for alternative bool type. This is only enabled if the code is
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// compiled with USE_MYBOOL defined. This catches some nasty type bugs.
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// For instance, 'bool b = "false";' results in b == true! This is a hidden
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// source of bugs.
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// However, redefining the bool type does have some negative impact on some
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// platforms. It gives rise to compiler warnings (i.e. with
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// MSVC) in the API header files when mixing code that uses the standard
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// bool with code that uses the redefined version.
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// This does not actually belong in the platform code, but needs to be
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// defined here because the platform code uses bool, and platform.h is
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// include very early in the main include file.
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#ifdef USE_MYBOOL
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typedef unsigned int __my_bool__;
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#define bool __my_bool__ // use 'indirection' to avoid name clashes
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#endif
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typedef uint8_t byte;
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typedef byte* Address;
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// Define our own macros for writing 64-bit constants. This is less fragile
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// than defining __STDC_CONSTANT_MACROS before including <stdint.h>, and it
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// works on compilers that don't have it (like MSVC).
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#if V8_HOST_ARCH_64_BIT
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#if defined(_MSC_VER)
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#define V8_UINT64_C(x) (x ## UI64)
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#define V8_INT64_C(x) (x ## I64)
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#define V8_INTPTR_C(x) (x ## I64)
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#define V8_PTR_PREFIX "ll"
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#elif defined(__MINGW64__)
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#define V8_UINT64_C(x) (x ## ULL)
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#define V8_INT64_C(x) (x ## LL)
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#define V8_INTPTR_C(x) (x ## LL)
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#define V8_PTR_PREFIX "I64"
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#else
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#define V8_UINT64_C(x) (x ## UL)
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#define V8_INT64_C(x) (x ## L)
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#define V8_INTPTR_C(x) (x ## L)
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#define V8_PTR_PREFIX "l"
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#endif
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#else // V8_HOST_ARCH_64_BIT
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#define V8_INTPTR_C(x) (x)
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#define V8_PTR_PREFIX ""
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#endif // V8_HOST_ARCH_64_BIT
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// The following macro works on both 32 and 64-bit platforms.
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// Usage: instead of writing 0x1234567890123456
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// write V8_2PART_UINT64_C(0x12345678,90123456);
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#define V8_2PART_UINT64_C(a, b) (((static_cast<uint64_t>(a) << 32) + 0x##b##u))
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#define V8PRIxPTR V8_PTR_PREFIX "x"
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#define V8PRIdPTR V8_PTR_PREFIX "d"
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// Fix for Mac OS X defining uintptr_t as "unsigned long":
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#if defined(__APPLE__) && defined(__MACH__)
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#undef V8PRIxPTR
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#define V8PRIxPTR "lx"
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#endif
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#if (defined(__APPLE__) && defined(__MACH__)) || \
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defined(__FreeBSD__) || defined(__OpenBSD__)
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#define USING_BSD_ABI
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#endif
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// -----------------------------------------------------------------------------
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// Constants
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const int KB = 1024;
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const int MB = KB * KB;
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const int GB = KB * KB * KB;
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const int kMaxInt = 0x7FFFFFFF;
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const int kMinInt = -kMaxInt - 1;
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const uint32_t kMaxUInt32 = 0xFFFFFFFFu;
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const int kCharSize = sizeof(char); // NOLINT
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const int kShortSize = sizeof(short); // NOLINT
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const int kIntSize = sizeof(int); // NOLINT
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const int kDoubleSize = sizeof(double); // NOLINT
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const int kIntptrSize = sizeof(intptr_t); // NOLINT
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const int kPointerSize = sizeof(void*); // NOLINT
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const int kDoubleSizeLog2 = 3;
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// Size of the state of a the random number generator.
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const int kRandomStateSize = 2 * kIntSize;
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#if V8_HOST_ARCH_64_BIT
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const int kPointerSizeLog2 = 3;
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const intptr_t kIntptrSignBit = V8_INT64_C(0x8000000000000000);
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const uintptr_t kUintptrAllBitsSet = V8_UINT64_C(0xFFFFFFFFFFFFFFFF);
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#else
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const int kPointerSizeLog2 = 2;
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const intptr_t kIntptrSignBit = 0x80000000;
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const uintptr_t kUintptrAllBitsSet = 0xFFFFFFFFu;
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#endif
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const int kBitsPerByte = 8;
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const int kBitsPerByteLog2 = 3;
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const int kBitsPerPointer = kPointerSize * kBitsPerByte;
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const int kBitsPerInt = kIntSize * kBitsPerByte;
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// IEEE 754 single precision floating point number bit layout.
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const uint32_t kBinary32SignMask = 0x80000000u;
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const uint32_t kBinary32ExponentMask = 0x7f800000u;
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const uint32_t kBinary32MantissaMask = 0x007fffffu;
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const int kBinary32ExponentBias = 127;
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const int kBinary32MaxExponent = 0xFE;
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const int kBinary32MinExponent = 0x01;
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const int kBinary32MantissaBits = 23;
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const int kBinary32ExponentShift = 23;
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// Quiet NaNs have bits 51 to 62 set, possibly the sign bit, and no
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// other bits set.
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const uint64_t kQuietNaNMask = static_cast<uint64_t>(0xfff) << 51;
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// ASCII/UTF-16 constants
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// Code-point values in Unicode 4.0 are 21 bits wide.
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// Code units in UTF-16 are 16 bits wide.
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typedef uint16_t uc16;
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typedef int32_t uc32;
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const int kASCIISize = kCharSize;
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const int kUC16Size = sizeof(uc16); // NOLINT
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const uc32 kMaxAsciiCharCode = 0x7f;
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const uint32_t kMaxAsciiCharCodeU = 0x7fu;
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// The expression OFFSET_OF(type, field) computes the byte-offset
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// of the specified field relative to the containing type. This
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// corresponds to 'offsetof' (in stddef.h), except that it doesn't
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// use 0 or NULL, which causes a problem with the compiler warnings
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// we have enabled (which is also why 'offsetof' doesn't seem to work).
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// Here we simply use the non-zero value 4, which seems to work.
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#define OFFSET_OF(type, field) \
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(reinterpret_cast<intptr_t>(&(reinterpret_cast<type*>(4)->field)) - 4)
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// The expression ARRAY_SIZE(a) 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(a) \
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((sizeof(a) / sizeof(*(a))) / \
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static_cast<size_t>(!(sizeof(a) % sizeof(*(a)))))
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// The USE(x) template is used to silence C++ compiler warnings
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// issued for (yet) unused variables (typically parameters).
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template <typename T>
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inline void USE(T) { }
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// FUNCTION_ADDR(f) gets the address of a C function f.
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#define FUNCTION_ADDR(f) \
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(reinterpret_cast<v8::internal::Address>(reinterpret_cast<intptr_t>(f)))
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// FUNCTION_CAST<F>(addr) casts an address into a function
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// of type F. Used to invoke generated code from within C.
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template <typename F>
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F FUNCTION_CAST(Address addr) {
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return reinterpret_cast<F>(reinterpret_cast<intptr_t>(addr));
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}
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// A macro to disallow the evil copy constructor and operator= functions
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// This should be used in the private: declarations for a class
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#define DISALLOW_COPY_AND_ASSIGN(TypeName) \
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TypeName(const TypeName&); \
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void operator=(const TypeName&)
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// A macro to disallow all the implicit constructors, namely the
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// default constructor, copy constructor and operator= functions.
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//
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// This should be used in the private: declarations for a class
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// that wants to prevent anyone from instantiating it. This is
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// especially useful for classes containing only static methods.
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#define DISALLOW_IMPLICIT_CONSTRUCTORS(TypeName) \
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TypeName(); \
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DISALLOW_COPY_AND_ASSIGN(TypeName)
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// Define used for helping GCC to make better inlining. Don't bother for debug
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// builds. On GCC 3.4.5 using __attribute__((always_inline)) causes compilation
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// errors in debug build.
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#if defined(__GNUC__) && !defined(DEBUG)
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#if (__GNUC__ >= 4)
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#define INLINE(header) inline header __attribute__((always_inline))
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#define NO_INLINE(header) header __attribute__((noinline))
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#else
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#define INLINE(header) inline __attribute__((always_inline)) header
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#define NO_INLINE(header) __attribute__((noinline)) header
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#endif
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#else
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#define INLINE(header) inline header
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#define NO_INLINE(header) header
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#endif
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#if defined(__GNUC__) && __GNUC__ >= 4
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#define MUST_USE_RESULT __attribute__ ((warn_unused_result))
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#else
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#define MUST_USE_RESULT
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#endif
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// -----------------------------------------------------------------------------
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// Forward declarations for frequently used classes
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// (sorted alphabetically)
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class FreeStoreAllocationPolicy;
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template <typename T, class P = FreeStoreAllocationPolicy> class List;
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// -----------------------------------------------------------------------------
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// Declarations for use in both the preparser and the rest of V8.
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// The different language modes that V8 implements. ES5 defines two language
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// modes: an unrestricted mode respectively a strict mode which are indicated by
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// CLASSIC_MODE respectively STRICT_MODE in the enum. The harmony spec drafts
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// for the next ES standard specify a new third mode which is called 'extended
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// mode'. The extended mode is only available if the harmony flag is set. It is
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// based on the 'strict mode' and adds new functionality to it. This means that
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// most of the semantics of these two modes coincide.
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//
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// In the current draft the term 'base code' is used to refer to code that is
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// neither in strict nor extended mode. However, the more distinguishing term
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// 'classic mode' is used in V8 instead to avoid mix-ups.
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enum LanguageMode {
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CLASSIC_MODE,
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STRICT_MODE,
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EXTENDED_MODE
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};
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// The Strict Mode (ECMA-262 5th edition, 4.2.2).
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//
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// This flag is used in the backend to represent the language mode. So far
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// there is no semantic difference between the strict and the extended mode in
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// the backend, so both modes are represented by the kStrictMode value.
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enum StrictModeFlag {
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kNonStrictMode,
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kStrictMode
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};
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} } // namespace v8::internal
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#endif // V8_GLOBALS_H_
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