chore: enclose everything in namespace matar

Signed-off-by: Amneesh Singh <natto@weirdnatto.in>

src/cpu/arm/exec.cc

@@ -4,9 +4,10 @@
 
 using namespace logger;
 
+namespace matar {
 void
 CpuImpl::exec_arm(const arm::Instruction instruction) {
-    Condition cond            = instruction.condition;
+    arm::Condition cond       = instruction.condition;
     arm::InstructionData data = instruction.data;
 
     debug(cpsr.condition(cond));
@@ -537,3 +538,4 @@ CpuImpl::exec_arm(const arm::Instruction instruction) {
         } },
       data);
 }
+}

src/cpu/arm/instruction.cc

@@ -3,7 +3,8 @@
 #include "util/bits.hh"
 #include <iterator>
 
-using namespace arm;
+namespace matar {
+namespace arm {
 
 Instruction::Instruction(uint32_t insn)
   : condition(static_cast<Condition>(bit_range(insn, 28, 31))) {
@@ -495,3 +496,5 @@ Instruction::disassemble() {
         [](auto) { return std::string("unknown instruction"); } },
       data);
 }
+}
+}

src/cpu/arm/instruction.hh

@@ -1,3 +1,4 @@
+#pragma once
 #include "cpu/utility.hh"
 #include <cstdint>
 #include <variant>
@@ -9,6 +10,7 @@ struct overloaded : Ts... {
 template<class... Ts>
 overloaded(Ts...) -> overloaded<Ts...>;
 
+namespace matar {
 namespace arm {
 static constexpr size_t INSTRUCTION_SIZE = 4;
 
@@ -165,3 +167,4 @@ struct Instruction {
     std::string disassemble();
 };
 }
+}