[NOT FOR COMMIT] Native Client builds of V8 on ia32 and x64.

src/globals.h

Index: src/globals.h
diff --git a/src/globals.h b/src/globals.h
index 1606996d20b9e2fdc5f9e2144b167f3ac78aab6c..7724102eb5a91c1ef351d7bf3245908aea4ea13b 100644
--- a/src/globals.h
+++ b/src/globals.h
@@ -67,9 +67,21 @@ namespace internal {
 //   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 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
 #define V8_HOST_ARCH_64_BIT 1
 #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
@@ -95,7 +107,10 @@ namespace internal {
 // environment as presented by the compiler.
 #if !defined(V8_TARGET_ARCH_X64) && !defined(V8_TARGET_ARCH_IA32) && \
     !defined(V8_TARGET_ARCH_ARM) && !defined(V8_TARGET_ARCH_MIPS)
-#if defined(_M_X64) || defined(__x86_64__)
+#if defined(__native_client__)
+// use ARM JIT with interpreter to bootstrap NaCl port
+#define V8_TARGET_ARCH_ARM 1
+#elif defined(_M_X64) || defined(__x86_64__)
 #define V8_TARGET_ARCH_X64 1
 #elif defined(_M_IX86) || defined(__i386__)
 #define V8_TARGET_ARCH_IA32 1
@@ -135,6 +150,14 @@ namespace internal {
 #define USE_SIMULATOR 1
 #endif
 #endif
+// V8_ARM_ON_X86_64 is used to conditionally compile code for
+// using ARM code generation together with an ARM simulator on
+// x86_64 hosts.
+#if defined(__x86_64__)
+#if defined(V8_TARGET_ARCH_ARM) && defined(USE_SIMULATOR)
+#define V8_ARM_ON_X86_64 1
+#endif
+#endif
 
 // Support for alternative bool type. This is only enabled if the code is
 // compiled with USE_MYBOOL defined. This catches some nasty type bugs.