Add X32 port into V8

src/base/build_config.h

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_BASE_BUILD_CONFIG_H_
 #define V8_BASE_BUILD_CONFIG_H_
 
 #include "include/v8config.h"
 
 // Processor architecture detection.  For more info on what's defined, see:
 //   http://msdn.microsoft.com/en-us/library/b0084kay.aspx
 //   http://www.agner.org/optimize/calling_conventions.pdf
 //   or with gcc, run: "echo | gcc -E -dM -"
 #if defined(_M_X64) || defined(__x86_64__)
 #if defined(__native_client__)
 // For Native Client builds of V8, use V8_TARGET_ARCH_ARM, so that V8
 // generates ARM machine code, together with a portable ARM simulator
 // compiled for the host architecture in question.
 //
 // Since Native Client is ILP-32 on all architectures we use
 // V8_HOST_ARCH_IA32 on both 32- and 64-bit x86.
 #define V8_HOST_ARCH_IA32 1
 #define V8_HOST_ARCH_32_BIT 1
 #define V8_HOST_CAN_READ_UNALIGNED 1
 #else
 #define V8_HOST_ARCH_X64 1
+#if defined(__x86_64__) && !defined(__LP64__)

[Nico, 2014/09/10 16:54:31]

Is this the best define you can check for? This now treats LLP64 hosts (windows)
as 32bit too (if one uses a compiler that definex __x86_64)

[Nico, 2014/09/10 17:44:59]

I think __SIZEOF_POINTER__ is a better thing to check. I'll send you a CL.

+#define V8_HOST_ARCH_32_BIT 1
+#else
 #define V8_HOST_ARCH_64_BIT 1
+#endif
 #define V8_HOST_CAN_READ_UNALIGNED 1
 #endif  // __native_client__
 #elif defined(_M_IX86) || defined(__i386__)
 #define V8_HOST_ARCH_IA32 1
 #define V8_HOST_ARCH_32_BIT 1
 #define V8_HOST_CAN_READ_UNALIGNED 1
 #elif defined(__AARCH64EL__)
 #define V8_HOST_ARCH_ARM64 1
 #define V8_HOST_ARCH_64_BIT 1
 #define V8_HOST_CAN_READ_UNALIGNED 1
@@ skipping 30 matching lines @@
 #define V8_TARGET_ARCH_ARM64 1
 #elif defined(__ARMEL__)
 #define V8_TARGET_ARCH_ARM 1
 #elif defined(__MIPSEB__) || defined(__MIPSEL__)
 #define V8_TARGET_ARCH_MIPS 1
 #else
 #error Target architecture was not detected as supported by v8
 #endif
 #endif
 
+// Determine architecture pointer size.
+#if V8_TARGET_ARCH_IA32
+#define V8_TARGET_ARCH_32_BIT 1
+#elif V8_TARGET_ARCH_X64
+#if !V8_TARGET_ARCH_32_BIT && !V8_TARGET_ARCH_64_BIT
+#if defined(__x86_64__) && !defined(__LP64__)
+#define V8_TARGET_ARCH_32_BIT 1
+#else
+#define V8_TARGET_ARCH_64_BIT 1
+#endif
+#endif
+#elif V8_TARGET_ARCH_ARM
+#define V8_TARGET_ARCH_32_BIT 1
+#elif V8_TARGET_ARCH_ARM64
+#define V8_TARGET_ARCH_64_BIT 1
+#elif V8_TARGET_ARCH_MIPS
+#define V8_TARGET_ARCH_32_BIT 1
+#elif V8_TARGET_ARCH_X87
+#define V8_TARGET_ARCH_32_BIT 1
+#else
+#error Unknown target architecture pointer size
+#endif
+
 // Check for supported combinations of host and target architectures.
 #if V8_TARGET_ARCH_IA32 && !V8_HOST_ARCH_IA32
 #error Target architecture ia32 is only supported on ia32 host
 #endif
-#if V8_TARGET_ARCH_X64 && !V8_HOST_ARCH_X64
+#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_64_BIT && \
+     !(V8_HOST_ARCH_X64 && V8_HOST_ARCH_64_BIT))
 #error Target architecture x64 is only supported on x64 host
 #endif
+#if (V8_TARGET_ARCH_X64 && V8_TARGET_ARCH_32_BIT && \
+     !(V8_HOST_ARCH_X64 && V8_HOST_ARCH_32_BIT))
+#error Target architecture x32 is only supported on x64 host with x32 support
+#endif
 #if (V8_TARGET_ARCH_ARM && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_ARM))
 #error Target architecture arm is only supported on arm and ia32 host
 #endif
 #if (V8_TARGET_ARCH_ARM64 && !(V8_HOST_ARCH_X64 || V8_HOST_ARCH_ARM64))
 #error Target architecture arm64 is only supported on arm64 and x64 host
 #endif
 #if (V8_TARGET_ARCH_MIPS && !(V8_HOST_ARCH_IA32 || V8_HOST_ARCH_MIPS))
 #error Target architecture mips is only supported on mips and ia32 host
 #endif
 
@@ skipping 16 matching lines @@
 #define V8_TARGET_LITTLE_ENDIAN 1
 #else
 #error Unknown target architecture endianness
 #endif
 
 #if V8_OS_MACOSX || defined(__FreeBSD__) || defined(__OpenBSD__)
 #define USING_BSD_ABI
 #endif
 
 #endif  // V8_BASE_BUILD_CONFIG_H_