Revert 21502 - "Move OS::MemCopy and OS::MemMove out of platform to utils"

src/platform-posix.cc

Index: src/platform-posix.cc
diff --git a/src/platform-posix.cc b/src/platform-posix.cc
index 2b5f40c9abc0bf3ac063b0431f7ee254654f9c8b..1972505565eef5c7dff7cb0a282a750547d7bdf0 100644
--- a/src/platform-posix.cc
+++ b/src/platform-posix.cc
@@ -447,6 +447,72 @@ int OS::VSNPrintF(Vector<char> str,
 }
 
 
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
+static void MemMoveWrapper(void* dest, const void* src, size_t size) {
+  memmove(dest, src, size);
+}
+
+
+// Initialize to library version so we can call this at any time during startup.
+static OS::MemMoveFunction memmove_function = &MemMoveWrapper;
+
+// Defined in codegen-ia32.cc.
+OS::MemMoveFunction CreateMemMoveFunction();
+
+// Copy memory area. No restrictions.
+void OS::MemMove(void* dest, const void* src, size_t size) {
+  if (size == 0) return;
+  // Note: here we rely on dependent reads being ordered. This is true
+  // on all architectures we currently support.
+  (*memmove_function)(dest, src, size);
+}
+
+#elif defined(V8_HOST_ARCH_ARM)
+void OS::MemCopyUint16Uint8Wrapper(uint16_t* dest,
+                                   const uint8_t* src,
+                                   size_t chars) {
+  uint16_t *limit = dest + chars;
+  while (dest < limit) {
+    *dest++ = static_cast<uint16_t>(*src++);
+  }
+}
+
+
+OS::MemCopyUint8Function OS::memcopy_uint8_function = &OS::MemCopyUint8Wrapper;
+OS::MemCopyUint16Uint8Function OS::memcopy_uint16_uint8_function =
+    &OS::MemCopyUint16Uint8Wrapper;
+// Defined in codegen-arm.cc.
+OS::MemCopyUint8Function CreateMemCopyUint8Function(
+    OS::MemCopyUint8Function stub);
+OS::MemCopyUint16Uint8Function CreateMemCopyUint16Uint8Function(
+    OS::MemCopyUint16Uint8Function stub);
+
+#elif defined(V8_HOST_ARCH_MIPS)
+OS::MemCopyUint8Function OS::memcopy_uint8_function = &OS::MemCopyUint8Wrapper;
+// Defined in codegen-mips.cc.
+OS::MemCopyUint8Function CreateMemCopyUint8Function(
+    OS::MemCopyUint8Function stub);
+#endif
+
+
+void OS::PostSetUp() {
+#if V8_TARGET_ARCH_IA32 || V8_TARGET_ARCH_X87
+  OS::MemMoveFunction generated_memmove = CreateMemMoveFunction();
+  if (generated_memmove != NULL) {
+    memmove_function = generated_memmove;
+  }
+#elif defined(V8_HOST_ARCH_ARM)
+  OS::memcopy_uint8_function =
+      CreateMemCopyUint8Function(&OS::MemCopyUint8Wrapper);
+  OS::memcopy_uint16_uint8_function =
+      CreateMemCopyUint16Uint8Function(&OS::MemCopyUint16Uint8Wrapper);
+#elif defined(V8_HOST_ARCH_MIPS)
+  OS::memcopy_uint8_function =
+      CreateMemCopyUint8Function(&OS::MemCopyUint8Wrapper);
+#endif
+}
+
+
 // ----------------------------------------------------------------------------
 // POSIX string support.
 //