[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

git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@361484 91177308-0d34-0410-b5e6-96231b3b80d8

5 files changed, 26 insertions, 26 deletions

diff --git a/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp b/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
index 130adbd60..6323889c2 100644
--- a/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
+++ b/source/Plugins/Instruction/ARM/EmulateInstructionARM.cpp
@@ -749,7 +749,7 @@ EmulateInstructionARM::CreateInstance(const ArchSpec &arch,
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionARM::SetTargetTriple(const ArchSpec &arch) {
@@ -13213,7 +13213,7 @@ EmulateInstructionARM::GetARMOpcodeForInstruction(const uint32_t opcode,
         (g_arm_opcodes[i].variants & arm_isa) != 0)
       return &g_arm_opcodes[i];
   }
-  return NULL;
+  return nullptr;
 }
 
 EmulateInstructionARM::ARMOpcode *
@@ -13763,7 +13763,7 @@ EmulateInstructionARM::GetThumbOpcodeForInstruction(const uint32_t opcode,
         (g_thumb_opcodes[i].variants & arm_isa) != 0)
       return &g_thumb_opcodes[i];
   }
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionARM::SetArchitecture(const ArchSpec &arch) {
@@ -14311,7 +14311,7 @@ bool EmulateInstructionARM::WriteFlags(Context &context, const uint32_t result,
 }
 
 bool EmulateInstructionARM::EvaluateInstruction(uint32_t evaluate_options) {
-  ARMOpcode *opcode_data = NULL;
+  ARMOpcode *opcode_data = nullptr;
 
   if (m_opcode_mode == eModeThumb)
     opcode_data =
@@ -14400,7 +14400,7 @@ bool EmulateInstructionARM::TestEmulation(Stream *out_stream, ArchSpec &arch,
   OptionValueSP value_sp = test_data->GetValueForKey(opcode_key);
 
   uint32_t test_opcode;
-  if ((value_sp.get() == NULL) ||
+  if ((value_sp.get() == nullptr) ||
       (value_sp->GetType() != OptionValue::eTypeUInt64)) {
     out_stream->Printf("TestEmulation: Error reading opcode from test file.\n");
     return false;
@@ -14426,7 +14426,7 @@ bool EmulateInstructionARM::TestEmulation(Stream *out_stream, ArchSpec &arch,
   EmulationStateARM after_state;
 
   value_sp = test_data->GetValueForKey(before_key);
-  if ((value_sp.get() == NULL) ||
+  if ((value_sp.get() == nullptr) ||
       (value_sp->GetType() != OptionValue::eTypeDictionary)) {
     out_stream->Printf("TestEmulation:  Failed to find 'before' state.\n");
     return false;
@@ -14439,7 +14439,7 @@ bool EmulateInstructionARM::TestEmulation(Stream *out_stream, ArchSpec &arch,
   }
 
   value_sp = test_data->GetValueForKey(after_key);
-  if ((value_sp.get() == NULL) ||
+  if ((value_sp.get() == nullptr) ||
       (value_sp->GetType() != OptionValue::eTypeDictionary)) {
     out_stream->Printf("TestEmulation:  Failed to find 'after' state.\n");
     return false;
diff --git a/source/Plugins/Instruction/ARM/EmulationStateARM.cpp b/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
index 37ec53bba..11c7677c2 100644
--- a/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
+++ b/source/Plugins/Instruction/ARM/EmulationStateARM.cpp
@@ -284,14 +284,14 @@ bool EmulationStateARM::LoadStateFromDictionary(
 
   // Load memory, if present.
 
-  if (value_sp.get() != NULL) {
+  if (value_sp.get() != nullptr) {
     static ConstString address_key("address");
     static ConstString data_key("data");
     uint64_t start_address = 0;
 
     OptionValueDictionary *mem_dict = value_sp->GetAsDictionary();
     value_sp = mem_dict->GetValueForKey(address_key);
-    if (value_sp.get() == NULL)
+    if (value_sp.get() == nullptr)
       return false;
     else
       start_address = value_sp->GetUInt64Value();
@@ -306,7 +306,7 @@ bool EmulationStateARM::LoadStateFromDictionary(
 
     for (uint32_t i = 0; i < num_elts; ++i) {
       value_sp = mem_array->GetValueAtIndex(i);
-      if (value_sp.get() == NULL)
+      if (value_sp.get() == nullptr)
         return false;
       uint64_t value = value_sp->GetUInt64Value();
       StoreToPseudoAddress(address, value);
@@ -315,7 +315,7 @@ bool EmulationStateARM::LoadStateFromDictionary(
   }
 
   value_sp = test_data->GetValueForKey(registers_key);
-  if (value_sp.get() == NULL)
+  if (value_sp.get() == nullptr)
     return false;
 
   // Load General Registers
@@ -328,7 +328,7 @@ bool EmulationStateARM::LoadStateFromDictionary(
     sstr.Printf("r%d", i);
     ConstString reg_name(sstr.GetString());
     value_sp = reg_dict->GetValueForKey(reg_name);
-    if (value_sp.get() == NULL)
+    if (value_sp.get() == nullptr)
       return false;
     uint64_t reg_value = value_sp->GetUInt64Value();
     StorePseudoRegisterValue(dwarf_r0 + i, reg_value);
@@ -336,7 +336,7 @@ bool EmulationStateARM::LoadStateFromDictionary(
 
   static ConstString cpsr_name("cpsr");
   value_sp = reg_dict->GetValueForKey(cpsr_name);
-  if (value_sp.get() == NULL)
+  if (value_sp.get() == nullptr)
     return false;
   StorePseudoRegisterValue(dwarf_cpsr, value_sp->GetUInt64Value());
 
@@ -346,7 +346,7 @@ bool EmulationStateARM::LoadStateFromDictionary(
     sstr.Printf("s%d", i);
     ConstString reg_name(sstr.GetString());
     value_sp = reg_dict->GetValueForKey(reg_name);
-    if (value_sp.get() == NULL)
+    if (value_sp.get() == nullptr)
       return false;
     uint64_t reg_value = value_sp->GetUInt64Value();
     StorePseudoRegisterValue(dwarf_s0 + i, reg_value);
diff --git a/source/Plugins/Instruction/ARM64/EmulateInstructionARM64.cpp b/source/Plugins/Instruction/ARM64/EmulateInstructionARM64.cpp
index c30d9bc90..d835d62ad 100644
--- a/source/Plugins/Instruction/ARM64/EmulateInstructionARM64.cpp
+++ b/source/Plugins/Instruction/ARM64/EmulateInstructionARM64.cpp
@@ -154,7 +154,7 @@ EmulateInstructionARM64::CreateInstance(const ArchSpec &arch,
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionARM64::SetTargetTriple(const ArchSpec &arch) {
@@ -411,7 +411,7 @@ bool EmulateInstructionARM64::ReadInstruction() {
 bool EmulateInstructionARM64::EvaluateInstruction(uint32_t evaluate_options) {
   const uint32_t opcode = m_opcode.GetOpcode32();
   Opcode *opcode_data = GetOpcodeForInstruction(opcode);
-  if (opcode_data == NULL)
+  if (opcode_data == nullptr)
     return false;
 
   // printf ("opcode template for 0x%8.8x: %s\n", opcode, opcode_data->name);
diff --git a/source/Plugins/Instruction/MIPS/EmulateInstructionMIPS.cpp b/source/Plugins/Instruction/MIPS/EmulateInstructionMIPS.cpp
index b5a657819..cbf3dda78 100644
--- a/source/Plugins/Instruction/MIPS/EmulateInstructionMIPS.cpp
+++ b/source/Plugins/Instruction/MIPS/EmulateInstructionMIPS.cpp
@@ -213,7 +213,7 @@ EmulateInstructionMIPS::CreateInstance(const ArchSpec &arch,
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionMIPS::SetTargetTriple(const ArchSpec &arch) {
@@ -966,7 +966,7 @@ EmulateInstructionMIPS::GetOpcodeForInstruction(const char *op_name) {
       return &g_opcodes[i];
   }
 
-  return NULL;
+  return nullptr;
 }
 
 uint32_t
@@ -1083,7 +1083,7 @@ bool EmulateInstructionMIPS::EvaluateInstruction(uint32_t evaluate_options) {
   */
   const char *op_name = m_insn_info->getName(mc_insn.getOpcode()).data();
 
-  if (op_name == NULL)
+  if (op_name == nullptr)
     return false;
 
   /*
@@ -1092,7 +1092,7 @@ bool EmulateInstructionMIPS::EvaluateInstruction(uint32_t evaluate_options) {
   */
   MipsOpcode *opcode_data = GetOpcodeForInstruction(op_name);
 
-  if (opcode_data == NULL)
+  if (opcode_data == nullptr)
     return false;
 
   uint64_t old_pc = 0, new_pc = 0;
@@ -2875,7 +2875,7 @@ bool EmulateInstructionMIPS::Emulate_MSA_Branch_DF(llvm::MCInst &insn,
   bool success = false, branch_hit = true;
   int32_t target = 0;
   RegisterValue reg_value;
-  const uint8_t *ptr = NULL;
+  const uint8_t *ptr = nullptr;
 
   uint32_t wt = m_reg_info->getEncodingValue(insn.getOperand(0).getReg());
   int32_t offset = insn.getOperand(1).getImm();
diff --git a/source/Plugins/Instruction/MIPS64/EmulateInstructionMIPS64.cpp b/source/Plugins/Instruction/MIPS64/EmulateInstructionMIPS64.cpp
index 7c1044c49..69f0278d1 100644
--- a/source/Plugins/Instruction/MIPS64/EmulateInstructionMIPS64.cpp
+++ b/source/Plugins/Instruction/MIPS64/EmulateInstructionMIPS64.cpp
@@ -200,7 +200,7 @@ EmulateInstructionMIPS64::CreateInstance(const ArchSpec &arch,
     }
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionMIPS64::SetTargetTriple(const ArchSpec &arch) {
@@ -931,7 +931,7 @@ EmulateInstructionMIPS64::GetOpcodeForInstruction(const char *op_name) {
       return &g_opcodes[i];
   }
 
-  return NULL;
+  return nullptr;
 }
 
 bool EmulateInstructionMIPS64::ReadInstruction() {
@@ -974,7 +974,7 @@ bool EmulateInstructionMIPS64::EvaluateInstruction(uint32_t evaluate_options) {
   */
   const char *op_name = m_insn_info->getName(mc_insn.getOpcode()).data();
 
-  if (op_name == NULL)
+  if (op_name == nullptr)
     return false;
 
   /*
@@ -983,7 +983,7 @@ bool EmulateInstructionMIPS64::EvaluateInstruction(uint32_t evaluate_options) {
   */
   MipsOpcode *opcode_data = GetOpcodeForInstruction(op_name);
 
-  if (opcode_data == NULL)
+  if (opcode_data == nullptr)
     return false;
 
   uint64_t old_pc = 0, new_pc = 0;
@@ -2186,7 +2186,7 @@ bool EmulateInstructionMIPS64::Emulate_MSA_Branch_DF(llvm::MCInst &insn,
   bool success = false, branch_hit = true;
   int64_t target = 0;
   RegisterValue reg_value;
-  const uint8_t *ptr = NULL;
+  const uint8_t *ptr = nullptr;
 
   uint32_t wt = m_reg_info->getEncodingValue(insn.getOperand(0).getReg());
   int64_t offset = insn.getOperand(1).getImm();