Minor Native Client specific changes to files in src.

These changes are required for Native Client validation and to
accomodate the limitations of the NaCl runtime.

BUG=2614

Review URL: https://chromiumcodereview.appspot.com/13704002
Patch from Brad Chen <bradchen@google.com>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@14187 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/d8.cc

@@ -144,6 +144,11 @@ class DumbLineEditor: public LineEditor {
 
 Handle<String> DumbLineEditor::Prompt(const char* prompt) {
   printf("%s", prompt);
+#if defined(__native_client__)
+  // Native Client libc is used to being embedded in Chrome and
+  // has trouble recognizing when to flush.
+  fflush(stdout);
+#endif
   return Shell::ReadFromStdin(isolate_);
 }
 

src/ia32/cpu-ia32.cc

@@ -79,6 +79,8 @@ void CPU::DebugBreak() {
   // instead
   // __asm { int 3 }
   __debugbreak();
+#elif defined(__native_client__)
+  asm("hlt");
 #else
   asm("int $3");
 #endif

src/platform-linux.cc

@@ -424,6 +424,8 @@ void OS::DebugBreak() {
 # endif
 #elif defined(__mips__)
   asm("break");
+#elif defined(__native_client__)
+  asm("hlt");
 #else
   asm("int $3");
 #endif
@@ -818,12 +820,16 @@ void Thread::set_name(const char* name) {
 
 void Thread::Start() {
   pthread_attr_t* attr_ptr = NULL;
+#if defined(__native_client__)
+  // use default stack size.
+#else
   pthread_attr_t attr;
   if (stack_size_ > 0) {
     pthread_attr_init(&attr);
     pthread_attr_setstacksize(&attr, static_cast<size_t>(stack_size_));
     attr_ptr = &attr;
   }
+#endif
   int result = pthread_create(&data_->thread_, attr_ptr, ThreadEntry, this);
   CHECK_EQ(0, result);
   ASSERT(data_->thread_ != kNoThread);
@@ -1070,6 +1076,11 @@ static int GetThreadID() {
 
 
 static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
+#if defined(__native_client__)
+  // As Native Client does not support signal handling, profiling
+  // is disabled.
+  return;
+#else
   USE(info);
   if (signal != SIGPROF) return;
   Isolate* isolate = Isolate::UncheckedCurrent();
@@ -1122,6 +1133,7 @@ static void ProfilerSignalHandler(int signal, siginfo_t* info, void* context) {
 #endif  // V8_HOST_ARCH_*
   sampler->SampleStack(sample);
   sampler->Tick(sample);
+#endif  // __native_client__
 }
 
 

src/platform-posix.cc

@@ -94,6 +94,12 @@ void OS::Guard(void* address, const size_t size) {
 
 
 void* OS::GetRandomMmapAddr() {
+#if defined(__native_client__)
+  // TODO(bradchen): restore randomization once Native Client gets
+  // smarter about using mmap address hints.
+  // See http://code.google.com/p/nativeclient/issues/3341
+  return NULL;
+#endif
   Isolate* isolate = Isolate::UncheckedCurrent();
   // Note that the current isolate isn't set up in a call path via
   // CpuFeatures::Probe. We don't care about randomization in this case because

src/v8utils.h

@@ -185,6 +185,13 @@ inline void MemsetPointer(T** dest, U* value, int counter) {
 #elif defined(V8_HOST_ARCH_X64)
 #define STOS "stosq"
 #endif
+#if defined(__native_client__)
+  // This STOS sequence does not validate for x86_64 Native Client.
+  // Here we #undef STOS to force use of the slower C version.
+  // TODO(bradchen): Profile V8 and implement a faster REP STOS
+  // here if the profile indicates it matters.
+#undef STOS
+#endif
 
 #if defined(__GNUC__) && defined(STOS)
   asm volatile(