[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

1 files changed, 10 insertions, 11 deletions

diff --git a/lldb/source/Expression/FunctionCaller.cpp b/lldb/source/Expression/FunctionCaller.cpp
index 5f5e3b86ccd..618c1a13212 100644
--- a/lldb/source/Expression/FunctionCaller.cpp
+++ b/lldb/source/Expression/FunctionCaller.cpp
@@ -35,10 +35,9 @@ FunctionCaller::FunctionCaller(ExecutionContextScope &exe_scope,
                                const Address &functionAddress,
                                const ValueList &arg_value_list,
                                const char *name)
-    : Expression(exe_scope, eKindFunctionCaller),
-      m_execution_unit_sp(), m_parser(),
-      m_jit_module_wp(), m_name(name ? name : "<unknown>"),
-      m_function_ptr(NULL), m_function_addr(functionAddress),
+    : Expression(exe_scope, eKindFunctionCaller), m_execution_unit_sp(),
+      m_parser(), m_jit_module_wp(), m_name(name ? name : "<unknown>"),
+      m_function_ptr(nullptr), m_function_addr(functionAddress),
       m_function_return_type(return_type),
       m_wrapper_function_name("__lldb_caller_function"),
       m_wrapper_struct_name("__lldb_caller_struct"), m_wrapper_args_addrs(),
@@ -138,7 +137,7 @@ bool FunctionCaller::WriteFunctionArguments(
 
   Process *process = exe_ctx.GetProcessPtr();
 
-  if (process == NULL)
+  if (process == nullptr)
     return return_value;
 
   lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
@@ -239,11 +238,11 @@ lldb::ThreadPlanSP FunctionCaller::GetThreadPlanToCallFunction(
 
   // FIXME: Use the errors Stream for better error reporting.
   Thread *thread = exe_ctx.GetThreadPtr();
-  if (thread == NULL) {
+  if (thread == nullptr) {
     diagnostic_manager.PutString(
         eDiagnosticSeverityError,
         "Can't call a function without a valid thread.");
-    return NULL;
+    return nullptr;
   }
 
   // Okay, now run the function:
@@ -279,7 +278,7 @@ bool FunctionCaller::FetchFunctionResults(ExecutionContext &exe_ctx,
 
   Process *process = exe_ctx.GetProcessPtr();
 
-  if (process == NULL)
+  if (process == nullptr)
     return false;
 
   lldb::ProcessSP jit_process_sp(m_jit_process_wp.lock());
@@ -326,7 +325,7 @@ lldb::ExpressionResults FunctionCaller::ExecuteFunction(
 
   lldb::addr_t args_addr;
 
-  if (args_addr_ptr != NULL)
+  if (args_addr_ptr != nullptr)
     args_addr = *args_addr_ptr;
   else
     args_addr = LLDB_INVALID_ADDRESS;
@@ -376,7 +375,7 @@ lldb::ExpressionResults FunctionCaller::ExecuteFunction(
   if (exe_ctx.GetProcessPtr())
     exe_ctx.GetProcessPtr()->SetRunningUserExpression(false);
 
-  if (args_addr_ptr != NULL)
+  if (args_addr_ptr != nullptr)
     *args_addr_ptr = args_addr;
 
   if (return_value != lldb::eExpressionCompleted)
@@ -384,7 +383,7 @@ lldb::ExpressionResults FunctionCaller::ExecuteFunction(
 
   FetchFunctionResults(exe_ctx, args_addr, results);
 
-  if (args_addr_ptr == NULL)
+  if (args_addr_ptr == nullptr)
     DeallocateFunctionResults(exe_ctx, args_addr);
 
   return lldb::eExpressionCompleted;