[lldb] NFC modernize codebase with modernize-use-nullptr

Summary:
NFC = [[ https://llvm.org/docs/Lexicon.html#nfc | Non functional change ]]

This commit is the result of modernizing the LLDB codebase by using
`nullptr` instread of `0` or `NULL`. See
https://clang.llvm.org/extra/clang-tidy/checks/modernize-use-nullptr.html
for more information.

This is the command I ran and I to fix and format the code base:

```
run-clang-tidy.py \
	-header-filter='.*' \
	-checks='-*,modernize-use-nullptr' \
	-fix ~/dev/llvm-project/lldb/.* \
	-format \
	-style LLVM \
	-p ~/llvm-builds/debug-ninja-gcc
```

NOTE: There were also changes to `llvm/utils/unittest` but I did not
include them because I felt that maybe this library shall be updated in
isolation somehow.

NOTE: I know this is a rather large commit but it is a nobrainer in most
parts.

Reviewers: martong, espindola, shafik, #lldb, JDevlieghere

Reviewed By: JDevlieghere

Subscribers: arsenm, jvesely, nhaehnle, hiraditya, JDevlieghere, teemperor, rnkovacs, emaste, kubamracek, nemanjai, ki.stfu, javed.absar, arichardson, kbarton, jrtc27, MaskRay, atanasyan, dexonsmith, arphaman, jfb, jsji, jdoerfert, lldb-commits, llvm-commits

Tags: #lldb, #llvm

Differential Revision: https://reviews.llvm.org/D61847

llvm-svn: 361484

2 files changed, 7 insertions, 7 deletions

diff --git a/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp b/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
index c35cb54bb69..029bdf48b12 100644
--- a/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
+++ b/lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_x86_64.cpp
@@ -29,13 +29,13 @@ static inline int get_cpuid_count(unsigned int __leaf,
                                   unsigned int *__eax, unsigned int *__ebx,
                                   unsigned int *__ecx, unsigned int *__edx)
 {
-    unsigned int __max_leaf = __get_cpuid_max(__leaf & 0x80000000, 0);
+  unsigned int __max_leaf = __get_cpuid_max(__leaf & 0x80000000, nullptr);
 
-    if (__max_leaf == 0 || __max_leaf < __leaf)
-        return 0;
+  if (__max_leaf == 0 || __max_leaf < __leaf)
+    return 0;
 
-    __cpuid_count(__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
-    return 1;
+  __cpuid_count(__leaf, __subleaf, *__eax, *__ebx, *__ecx, *__edx);
+  return 1;
 }
 
 using namespace lldb_private;
diff --git a/lldb/source/Plugins/Process/Linux/ProcessorTrace.cpp b/lldb/source/Plugins/Process/Linux/ProcessorTrace.cpp
index 749a765731b..a7e8c00f0fe 100644
--- a/lldb/source/Plugins/Process/Linux/ProcessorTrace.cpp
+++ b/lldb/source/Plugins/Process/Linux/ProcessorTrace.cpp
@@ -117,7 +117,7 @@ Status ProcessorTraceMonitor::StartTrace(lldb::pid_t pid, lldb::tid_t tid,
 
   errno = 0;
   auto base =
-      mmap(NULL, (metabufsize + page_size), PROT_WRITE, MAP_SHARED, fd, 0);
+      mmap(nullptr, (metabufsize + page_size), PROT_WRITE, MAP_SHARED, fd, 0);
 
   if (base == MAP_FAILED) {
     LLDB_LOG(log, "mmap base error {0}", errno);
@@ -133,7 +133,7 @@ Status ProcessorTraceMonitor::StartTrace(lldb::pid_t pid, lldb::tid_t tid,
   m_mmap_meta->aux_size = bufsize;
 
   errno = 0;
-  auto mmap_aux = mmap(NULL, bufsize, PROT_READ, MAP_SHARED, fd,
+  auto mmap_aux = mmap(nullptr, bufsize, PROT_READ, MAP_SHARED, fd,
                        static_cast<long int>(m_mmap_meta->aux_offset));
 
   if (mmap_aux == MAP_FAILED) {