8301504: Replace NULL with nullptr in os_cpu/linux_aarch64

Reviewed-by: kbarrett

src/hotspot/os_cpu/linux_aarch64/javaThread_linux_aarch64.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2003, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2003, 2023, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -64,7 +64,7 @@ bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava)
     intptr_t* ret_fp;
     intptr_t* ret_sp;
     address addr = os::fetch_frame_from_context(uc, &ret_sp, &ret_fp);
-    if (addr == NULL || ret_sp == NULL ) {
+    if (addr == nullptr || ret_sp == nullptr ) {
       // ucontext wasn't useful
       return false;
     }
@@ -72,7 +72,7 @@ bool JavaThread::pd_get_top_frame(frame* fr_addr, void* ucontext, bool isInJava)
     frame ret_frame(ret_sp, ret_fp, addr);
     if (!ret_frame.safe_for_sender(this)) {
 #ifdef COMPILER2
-      frame ret_frame2(ret_sp, NULL, addr);
+      frame ret_frame2(ret_sp, nullptr, addr);
       if (!ret_frame2.safe_for_sender(this)) {
         // nothing else to try if the frame isn't good
         return false;

src/hotspot/os_cpu/linux_aarch64/os_linux_aarch64.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1999, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1999, 2023, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, Red Hat Inc. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -112,14 +112,14 @@ address os::fetch_frame_from_context(const void* ucVoid,
   address epc;
   const ucontext_t* uc = (const ucontext_t*)ucVoid;
 
-  if (uc != NULL) {
+  if (uc != nullptr) {
     epc = os::Posix::ucontext_get_pc(uc);
     if (ret_sp) *ret_sp = os::Linux::ucontext_get_sp(uc);
     if (ret_fp) *ret_fp = os::Linux::ucontext_get_fp(uc);
   } else {
-    epc = NULL;
+    epc = nullptr;
-    if (ret_sp) *ret_sp = (intptr_t *)NULL;
+    if (ret_sp) *ret_sp = (intptr_t *)nullptr;
-    if (ret_fp) *ret_fp = (intptr_t *)NULL;
+    if (ret_fp) *ret_fp = (intptr_t *)nullptr;
   }
 
   return epc;
@@ -174,20 +174,20 @@ bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
 
 /*
   NOTE: does not seem to work on linux.
-  if (info == NULL || info->si_code <= 0 || info->si_code == SI_NOINFO) {
+  if (info == nullptr || info->si_code <= 0 || info->si_code == SI_NOINFO) {
     // can't decode this kind of signal
-    info = NULL;
+    info = nullptr;
   } else {
     assert(sig == info->si_signo, "bad siginfo");
   }
 */
   // decide if this trap can be handled by a stub
-  address stub = NULL;
+  address stub = nullptr;
 
-  address pc          = NULL;
+  address pc          = nullptr;
 
   //%note os_trap_1
-  if (info != NULL && uc != NULL && thread != NULL) {
+  if (info != nullptr && uc != nullptr && thread != nullptr) {
     pc = (address) os::Posix::ucontext_get_pc(uc);
 
     address addr = (address) info->si_addr;
@@ -225,9 +225,9 @@ bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
         // here if the underlying file has been truncated.
         // Do not crash the VM in such a case.
         CodeBlob* cb = CodeCache::find_blob(pc);
-        CompiledMethod* nm = (cb != NULL) ? cb->as_compiled_method_or_null() : NULL;
+        CompiledMethod* nm = (cb != nullptr) ? cb->as_compiled_method_or_null() : nullptr;
         bool is_unsafe_arraycopy = (thread->doing_unsafe_access() && UnsafeCopyMemory::contains_pc(pc));
-        if ((nm != NULL && nm->has_unsafe_access()) || is_unsafe_arraycopy) {
+        if ((nm != nullptr && nm->has_unsafe_access()) || is_unsafe_arraycopy) {
           address next_pc = pc + NativeCall::instruction_size;
           if (is_unsafe_arraycopy) {
             next_pc = UnsafeCopyMemory::page_error_continue_pc(pc);
@@ -248,7 +248,7 @@ bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
         // End life with a fatal error, message and detail message and the context.
         // Note: no need to do any post-processing here (e.g. signal chaining)
         va_list va_dummy;
-        VMError::report_and_die(thread, uc, NULL, 0, msg, detail_msg, va_dummy);
+        VMError::report_and_die(thread, uc, nullptr, 0, msg, detail_msg, va_dummy);
         va_end(va_dummy);
 
         ShouldNotReachHere();
@@ -290,9 +290,9 @@ bool PosixSignals::pd_hotspot_signal_handler(int sig, siginfo_t* info,
     }
   }
 
-  if (stub != NULL) {
+  if (stub != nullptr) {
     // save all thread context in case we need to restore it
-    if (thread != NULL) thread->set_saved_exception_pc(pc);
+    if (thread != nullptr) thread->set_saved_exception_pc(pc);
 
     os::Posix::ucontext_set_pc(uc, stub);
     return true;
@@ -331,7 +331,7 @@ size_t os::Posix::default_stack_size(os::ThreadType thr_type) {
 // helper functions for fatal error handler
 
 void os::print_context(outputStream *st, const void *context) {
-  if (context == NULL) return;
+  if (context == nullptr) return;
 
   const ucontext_t *uc = (const ucontext_t*)context;
 
@@ -343,7 +343,7 @@ void os::print_context(outputStream *st, const void *context) {
 }
 
 void os::print_tos_pc(outputStream *st, const void *context) {
-  if (context == NULL) return;
+  if (context == nullptr) return;
 
   const ucontext_t* uc = (const ucontext_t*)context;
 
@@ -360,7 +360,7 @@ void os::print_tos_pc(outputStream *st, const void *context) {
 }
 
 void os::print_register_info(outputStream *st, const void *context) {
-  if (context == NULL) return;
+  if (context == nullptr) return;
 
   const ucontext_t *uc = (const ucontext_t*)context;
 

src/hotspot/os_cpu/linux_aarch64/vm_version_linux_aarch64.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006, 2022, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2023, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2014, 2020, Red Hat Inc. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
@@ -157,9 +157,9 @@ void VM_Version::get_os_cpu_info() {
   if (FILE *f = os::fopen("/proc/cpuinfo", "r")) {
     // need a large buffer as the flags line may include lots of text
     char buf[1024], *p;
-    while (fgets(buf, sizeof (buf), f) != NULL) {
+    while (fgets(buf, sizeof (buf), f) != nullptr) {
-      if ((p = strchr(buf, ':')) != NULL) {
+      if ((p = strchr(buf, ':')) != nullptr) {
-        long v = strtol(p+1, NULL, 0);
+        long v = strtol(p+1, nullptr, 0);
         if (strncmp(buf, "CPU implementer", sizeof "CPU implementer" - 1) == 0) {
           _cpu = v;
         } else if (strncmp(buf, "CPU variant", sizeof "CPU variant" - 1) == 0) {
@@ -181,7 +181,7 @@ void VM_Version::get_os_cpu_info() {
 }
 
 static bool read_fully(const char *fname, char *buf, size_t buflen) {
-  assert(buf != NULL, "invalid argument");
+  assert(buf != nullptr, "invalid argument");
   assert(buflen >= 1, "invalid argument");
   int fd = os::open(fname, O_RDONLY, 0);
   if (fd != -1) {
@@ -211,10 +211,10 @@ void VM_Version::get_compatible_board(char *buf, int buflen) {
     "/proc/device-tree/compatible",
     "/sys/devices/virtual/dmi/id/board_name",
     "/sys/devices/virtual/dmi/id/product_name",
-    NULL
+    nullptr
   };
 
-  for (const char **fname = board_name_file_list; *fname != NULL; fname++) {
+  for (const char **fname = board_name_file_list; *fname != nullptr; fname++) {
     if (read_fully(*fname, buf, buflen)) {
       return;
     }